Listening to an invisible organ
Long before it was an image, a pressure curve, an electrical trace or a stream of numbers on a monitor, the heart was a sound.
For centuries a physician had two options: feel the pulse at the wrist, or put an ear against the patient’s chest, with all the awkwardness that implied. In 1816 René Laennec was asked to examine a young woman with symptoms of heart disease. Her build made palpation of little use, and her age and sex ruled out putting his ear to her chest. So he rolled a sheet of paper into a tube, and the heart came through more clearly than he had expected. The wooden cylinder he built afterwards turned listening into a clinical method that could be reproduced and taught. What he did next mattered even more. Laennec did not stop at hearing noises: he matched what he heard at the bedside with what he found at autopsy, case after case. Auscultation thus became part of a new way of knowing in medicine, one in which processes hidden inside the body could be inferred from signs at its surface.
This is the point worth holding on to. A sound, on its own, is just an acoustic event; it becomes a sign only once someone has learned how to read it.
When I hear a murmur, I am not hearing a valve lesion. Nobody is. What reaches the ear is vibration (blood accelerating through a narrowed or leaking orifice, leaflets and walls set in motion), and the lesion is something reconstructed from it through an anatomical and physiological model. S1 coincides in time with closure of the mitral and tricuspid valves and marks the onset of ventricular systole. S2 goes with aortic and pulmonary closure, at the turn into diastole. The rest (splitting, intensity, a third or fourth sound, a murmur, a pause that lasts a fraction too long) is what turns a repetitive rhythm into information.
Medicine, put simply, is in the business of turning sound into meaning.
Music does something oddly similar and, in another sense, almost the reverse. It starts from rhythm, duration, silence, repetition and timbre, and builds a different kind of meaning out of them: expectation, anxiety, movement, memory, desire, vulnerability. Sometimes death.
Few sounds live in both worlds as naturally as the heartbeat. What follows is an attempt to track the heartbeat in music and medicine side by side, across seven works and roughly a century and a half, with a clinician’s ear rather than a musicologist’s training.
A rhythm we know before we understand it
Among the organs, the heart is odd in one respect: what it does is intrinsically temporal. We tend to describe a liver by its structure and a kidney by what it filters. The lung moves too, granted, but we rarely think of breathing as a series of discrete events. The heart presents itself that way from the start.
Beat, pause. Beat, pause.
You do not need to know anything about electrophysiology, stroke volume or valve mechanics to grasp that a living heart has to keep going, and this is why its repetition carries so much weight. As long as the next beat arrives, life goes on. A faster pulse reads as effort, fear or excitement; an irregular one breeds unease. A pulse that slows, and keeps slowing, suggests exhaustion or worse. And when the expected beat simply fails to come, the result is the most powerful event of all, which is silence.
Cardiac surgeons know that silence from an unusual angle, because we produce it on purpose. After cardioplegia the heart stops, the ECG trace goes flat, and for as long as the repair takes the patient is kept alive by a circuit that delivers flow with little or no pulse. Then the cross-clamp comes off and, more often than not, the first beats return on their own (sometimes they need a shock). However many times you have seen it, that moment never feels entirely routine.
It is also why the heartbeat works so well in music. Music, too, runs on expectation over time. Once a pulse is established, the listener predicts the next event, and the composer is free to deliver it, hold it back, bend it or take it away without warning.
The link goes a little beyond metaphor. Musical rhythm does interact with bodily rhythms at perceptual, motor and autonomic levels, though the physiology is far messier than the popular line that “the heart synchronizes with the music” would suggest; anyone who has looked at the actual data knows it is not that tidy. Rhythmic entrainment has nonetheless become a useful framework for explaining how temporal structure feeds into musical emotion, a case Trost and colleagues make in some detail.
So the heartbeat comes to music already loaded: a biological rhythm that doubles as a ready-made musical archetype.
A caveat, though, and not a small one. Not every repeated figure in a score is a heartbeat, and when a listener does hear one it may be for quite different reasons. The composer may have meant it explicitly. The programme of the piece may point strongly in that direction. Critics, decades later, may have read a pulse as cardiac. Or a physician may recognize, after the fact, something that resembles a particular arrhythmia.
These are four different claims, and they are easily confused. The seven examples below are worth discussing because they fall at different points along that range.
Seven musical hearts
Beethoven — the heart as interruption
String Quartet No. 13 in B-flat major, Op. 130 — V. Cavatina
I start with Beethoven because, medically speaking, his is the most provocative case.
The Cavatina is among the most inward movements of the late quartets. For its first 39 measures it sings, with hardly a break in the lyrical line. At measure 40 something gives way.
Beethoven writes beklemmt over the passage. The German resists a clean translation: constricted, oppressed, short of breath, choked with feeling. The texture changes just as abruptly. The three lower instruments settle into a repeated triplet pulse while the first violin offers a broken, hesitant line that never quite fits the rhythm beneath it. The music theorist Judith Ofcarcik describes exactly this: lower voices pulsing under a first-violin melody that sounds fractured and emotionally choked, the two layers in rhythmic conflict with each other.
For a cardiologist (or a cardiac surgeon, for that matter) it is hard not to hear physiology here.
That temptation has even made it into print. In 2014 Goldberger, Whiting and Howell went through several passages in Beethoven and proposed that some of them might reflect the subjective experience of a cardiac arrhythmia. Their paper does not establish a retrospective diagnosis, and it could not prove that this music transcribes Beethoven’s own heartbeat. What it shows is more modest and, to my mind, more interesting: the hypothesis is plausible enough to be worth examining where musicology, medicine and biography meet.
The uncertainty is what makes the example useful. It forces us to separate hearing an arrhythmia in music from claiming that the composer had one, two propositions that are easily blurred and quite different in what they assert.
Berlioz — the heart as passion
Symphonie fantastique — I. Rêveries–Passions
Berlioz takes us somewhere else entirely, into an openly psychological world.
The Symphonie fantastique hangs on the idée fixe, the recurring melody that stands for the artist’s beloved. When it first appears in the opening movement, it is punctuated by short, detached orchestral pulses that have often been interpreted as the artist’s pounding heart. The reading is convincing for a simple reason: Berlioz’s whole programme is concerned with what obsessive passion does to the body.
Around measure 78, the device becomes particularly clear: pairs of short notes punctuate the melodic line like a recurrent physical pulse.
Nothing is failing here. This heart is pounding.
The effect is not one of simple acceleration. The short, detached pulses beneath the idée fixe give the music a bodily presence, as though passion had become physically audible. Emotion turns into physiology and physiology into orchestral gesture, so that love stops being an abstract state and becomes something that happens to the body.
Richard Strauss — the heart as vulnerable life
Tod und Verklärung (Death and Transfiguration), Op. 24
Strauss opens Death and Transfiguration not with death but with life hanging on.
The tone poem is about a dying man. Strauss himself described the scene: a sick man in bed in his final hours, drifting between suffering, memories of his life and, at the end, transfiguration. The slow introduction gives us heavy, irregular breathing and a body whose condition is anything but stable. Against that background the soft recurring figures in the strings and timpani are almost impossible to hear neutrally. They pulse.
Where Berlioz’s heart pounds, Strauss’s hesitates. The rhythm seems to go on because it has to, not because it wants to get anywhere. Its slight instability is the whole point: a perfectly metronomic pulse would sound like a machine, whereas Strauss puts us at the bedside of a living organism whose continuation is no longer guaranteed.
This is one of the places where musical representation comes closest to clinical observation. What matters is not just that there is a beat but what kind of beat it is, its quality: weak, irregular, unstable, wrapped in breath. That is how we listen at the bedside. With a patient who is going downhill, in my experience, you register the character of the pulse under your fingers well before you get round to counting it.
Tchaikovsky — the heart as extinction
Symphony No. 6 in B minor, “Pathétique” — IV. Finale
Tchaikovsky’s Sixth overturns one of the deepest conventions of the symphonic tradition. There is no triumphant close. The symphony dies.
Over its last pages energy drains out of the orchestra until almost nothing is left, and the low strings hold and repeat a pulse beneath a texture that grows quieter and emptier. It works because repetition has already taught us to expect continuation. Another pulse should come, and then another. Instead the music keeps weakening, and by the closing pages it becomes hard to keep musical rhythm and physiological rhythm apart.
Programme notes often call this a dying heartbeat. Fair enough, but the phrase belongs to the interpreters rather than to Tchaikovsky, and it should be presented that way.
The trajectory is what counts. Berlioz speeds the heart up with passion and Strauss makes it fragile; Tchaikovsky lets it expire. The device itself is almost disarmingly simple. The pulse gets softer, more isolated, less inevitable, until at some point the next beat just doesn’t come.
Puccini — the heart disappearing beneath the drama
La Bohème — Act IV, death of Mimì
Mimì’s death is one of the great acts of restraint in opera.
She does not go out on a grand vocal statement. The actual moment of her death is, theatrically speaking, almost invisible, and Helen Greenwald has drawn attention to the stillness of the scene: neither the score nor the libretto explicitly marks Mimì’s passing. The orchestra seems to know before anyone on stage does.
In the passage before the others realize she has gone, the texture thins out steadily and the harp and low strings take on a weight of their own. One detailed study of how Puccini handles the deaths of his heroines reads the harp and double basses as Mimì’s slowing heartbeat, with sustained lines accompanying her final breath as it fades.
Then Puccini does something counterintuitive. At the moment life actually leaves her, he does not make the music louder. He makes it almost inaudible. Only later, when the other characters grasp what has happened (Rodolfo last of all), does the orchestra find its dramatic voice again.
It is about as close as music gets to something every clinician learns early on: catastrophe is not always noisy. Sometimes the decisive event is not an alarm going off but a signal that is no longer there, and the absence itself becomes the sign.
Mahler — the heart as an interpretive problem
Symphony No. 9 — I. Andante comodo
No heartbeat reading is more famous than the one attached to the opening of Mahler’s Ninth, and few are more disputed.
The music starts before it seems quite able to start. A short figure in the cellos is answered by the horn, with gaps between the pieces; the pattern returns, vanishes, returns again. Around it the harp and other fragments begin to appear, the raw material from which the movement slowly assembles itself.
Leonard Bernstein famously heard in this opening Mahler’s own failing, irregular heartbeat. It is a seductive idea. Mahler knew he had significant heart disease, and the Ninth has long been heard through the lens of his mortality. (He died in 1911 of bacterial endocarditis, a complication of valve disease that today would be treated with antibiotics and, quite possibly, surgery.)
Charles Amenta’s close examination of the Bernstein “heart-beat” hypothesis is valuable because it pulls the musical observation apart from the medical overstatement. Amenta finds the heartbeat reading musically defensible, while questioning whether “arrhythmia” is an accurate way to describe Mahler’s condition.
The distinction deserves to stay explicit. Hearing a heartbeat-like construction in the opening is reasonable; turning it into an electrocardiographic diagnosis of Gustav Mahler is not. I am not sure we need the diagnosis anyway.
What is remarkable about the opening is how few notes it takes to establish vulnerability. The pulse doesn’t simply sit there. It sounds as though it is negotiating whether it can carry on.
Pink Floyd — the heart becomes the frame
Speak to Me / The Dark Side of the Moon
By 1973 the ambiguity is gone. The Dark Side of the Moon opens with a heartbeat, or rather with a sound built on purpose to work as one.
For Speak to Me, Nick Mason put together fragments that preview the whole album (voices, clocks, cash registers, laughter, assorted effects) over the repeated low-frequency thump that opens the record and comes back at its close.
Conceptually this is a different thing from all the classical cases. No score is needed to infer the heart; the listener is simply placed inside a body. Since the pulse returns after Eclipse, the album ends up enclosed between heartbeats, and everything it deals with (birth and death, time, madness, money, mortality) happens inside that frame.
There is a nice irony here. The famous “heartbeat” was engineered in the studio and is not a recording of anyone’s heart, so the most literal heartbeat in the whole sequence is also one of the least physiologically literal. Representation, at this point, has come loose from anatomy.
Pink Floyd — “Speak to Me / Breathe”. YouTube embed; all rights remain with the respective rights holders.
These hearts are not all saying the same thing
Put the seven side by side and it becomes clear that the “heartbeat in music” is not one technique but several.
| Work | The heart functions as… | Evidential status |
|---|---|---|
| Beethoven, Cavatina | disturbance / possible arrhythmia | retrospective medico-musicological hypothesis |
| Berlioz, Symphonie fantastique | passion / pounding heart | established interpretive reading within a programmatic work |
| Strauss, Tod und Verklärung | vulnerable bodily life | strongly supported by the explicit death-bed programme |
| Tchaikovsky, Pathétique | extinction / dying pulse | compelling musical interpretation |
| Puccini, La Bohème | fading life / disappearance | supported by musicological analysis of the death scene |
| Mahler, Symphony No. 9 | fragile or irregular heartbeat | famous but debated interpretive hypothesis |
| Pink Floyd, Speak to Me | biological existence itself | explicit sound design |
The gradient matters. Lumping every example together as a composer “imitating a heartbeat” would flatten exactly what makes them interesting. In some cases the pulse is literal; in others it serves the narrative. Two of them, Beethoven and Mahler, rest largely on retrospective readings. And some heartbeats, I suspect, exist only because our own bodies have taught us how to hear them.
What exactly are we listening to?
Which raises a broader, epistemological question.
When a cardiologist hears an irregular rhythm through the stethoscope, the sound is not the disease. It is evidence, from which a physiological process is inferred. Something similar happens when a listener hears an irregular pulse in Beethoven or Mahler, except that the chain of inference runs the other way.
In medicine:
sound → pattern → physiological interpretation
In music:
pattern → bodily association → emotional or narrative interpretation
Both rest on the same human capacity to recognize patterns in time, and both can go wrong. Physicians hear murmurs that are not there (most of us have, usually late in a long shift). Listeners project heartbeats onto figures the composer never meant as such. Expertise does not remove interpretation from the process; at best it makes it more disciplined.
That is why the uncertainty around Beethoven and Mahler should not be treated as a nuisance to be cleared away. It is part of the point.
Did Beethoven have an arrhythmia? Did Mahler deliberately write his own heartbeat into the score? Both are legitimate questions, but neither is the one I find most interesting, which is this: why can a short sequence of notes make us hear a body at all?
The clinical ear in the age of images
Over the past two centuries medicine has become steadily less acoustic. The nineteenth-century physician listened. The twentieth-century cardiologist recorded electrical signals, pressures and phonocardiograms, and today’s clinician works surrounded by echocardiograms, CT and MRI datasets, wearable sensors and monitors that never stop updating. Now algorithms are starting to read some of those signals for us.
Electronic stethoscopes already amplify, record, store and display heart sounds, and automated interpretation, whether rule-based or built on machine learning, is the natural next step.
It is a real gain, and I would not want to go back. But every technological gain also changes the kind of attention we practise. A waveform asks to be measured and an image to be inspected; a probability pushes you towards a decision. Listening asks for something else, namely waiting. There is no rhythm in a single instant. You need time, because each new event changes the meaning of the one before it, and that holds for a cardiac examination just as it does for music.
Even the operating theatre, which looks like the most visual environment in medicine, is full of sound, and much of that sound is information. The pitch of the pulse oximeter falls as saturation drops, and it is common to register the change before anyone has looked at the number on the screen.
This may be one reason why auscultation still matters, even now that echocardiography shows far more anatomy than Laennec could have imagined. The stethoscope is not simply a source of lower-grade data left over from an earlier era. It trains a particular kind of clinical attention: the habit of recognizing pattern through time.
From signal to patient
AI will almost certainly get better at identifying pathological signals. An algorithm may classify a murmur more accurately than a tired physician at three in the morning; a wearable may flag an arrhythmia hours before the patient notices anything. Multimodal systems that fuse ECG, imaging, laboratory values and clinical records may produce representations that no human being could reproduce unaided.
None of this makes listening irrelevant. If anything, it makes the difference between detection and meaning more important. A machine can tell that a rhythm has changed. What that change means for a particular person (say, an 82-year-old, frail, anticoagulated, with surgery booked for next week) is still a medical decision.
And this is where the humanities turn out to be more relevant than one might expect. Music is a reminder that rhythm is never perceived as frequency alone; context changes what it means. A repeated pulse is excitement in Berlioz and oppression in Beethoven. In Strauss it becomes vulnerability, in Tchaikovsky approaching extinction, in Puccini a quiet disappearance. Mahler gives it existential uncertainty, and Pink Floyd makes it stand for life itself.
The acoustic pattern is where things start, not where they end, and the interpretation happens around it. Clinical medicine is not so different.
The sound before the silence
There is one more reason the heartbeat carries such power in art. It is one of very few physiological signals whose disappearance everyone understands at once, without any medical education.
While the heartbeat goes on, the future stays open. When it stops, time closes.
That is why the most affecting moments in these works are seldom the loudest. Puccini lets Mimì slip away almost unnoticed, and Tchaikovsky simply allows the low pulse to dissolve. Mahler opens with a rhythm that seems unsure it will continue. Pink Floyd, at the very end, brings back the heartbeat the album started with.
Their force comes from expectation. We wait for the next beat because our own body has taught us that there should be one.
Medicine turned that expectation into a diagnostic sign, and music turned it into a metaphor. Both start from the same act, listening. Even now, with the echo report already in the chart, most of us still put a stethoscope on the patient’s chest before surgery. It seldom tells us anything new. We do it anyway, and I suspect the reason is not purely diagnostic.
Selected references and further reading
Rapoport J. Laënnec and the discovery of auscultation. Israel Journal of Medical Sciences. 1986;22:597–601.
https://pubmed.ncbi.nlm.nih.gov/3536799/Dornbush S, Turnquest AE. Physiology, Heart Sounds. StatPearls / NCBI Bookshelf.
https://www.ncbi.nlm.nih.gov/books/NBK541010/Goldberger ZD, Whiting SM, Howell JD. The Heartfelt Music of Ludwig van Beethoven. Perspectives in Biology and Medicine. 2014;57:285–294. doi:10.1353/pbm.2014.0013.
https://pubmed.ncbi.nlm.nih.gov/25544329/Ofcarcik J. Multi-Strand Musical Narratives: An Introduction. Music Theory Online. 2020;26(2). doi:10.30535/mto.26.2.10.
https://mtosmt.org/issues/mto.20.26.2/mto.20.26.2.ofcarcik.htmlAmenta C. The Opening of the Mahler Ninth Symphony and the Bernstein “Heart-Beat” Hypothesis.
Greenwald H. Ars moriendi: Reflections on the Death of Mimì. In: The Arts of the Prima Donna in the Long Nineteenth Century. Oxford University Press, 2012.
Trost WJ, Labbé C, Grandjean D. Rhythmic entrainment as a musical affect induction mechanism. Neuropsychologia. 2017;96:96–110.
https://pubmed.ncbi.nlm.nih.gov/28069444/