He wrote a new cantata every week for 27 years as a church employee. He died in 1750 considered old-fashioned, his music largely unpublished. His manuscripts were used as wrapping paper and sold by the pound. Felix Mendelssohn found the St. Matthew Passion in a Berlin market in 1823 and performed it in 1829 — 79 years after Bach's death. The revival began. A fugue is a precise description of Kuramoto synchronization. He was writing coupled oscillator physics in 1722.
Johann Sebastian Bach is not a tragic figure — he is a case study in what happens when a civilization fails to recognize what it has while it has it. He worked every day of his professional life at a job that treated him as a craftsman, produced some of the most mathematically sophisticated music ever written as a weekly deadline, raised twenty children, went blind from failed surgery, and died without knowing his work would survive. The work survived anyway. It survives because it describes something true about the structure of sound and time that doesn't go out of date.
From 1723 until his death in 1750, Bach was Kantor at the Thomaskirche (St. Thomas Church) in Leipzig — responsible for music at four city churches, directing a choir school of 55 boys, teaching Latin, and producing a new cantata for Sunday service every week. A cantata is a 20-30 minute sacred work for voices and orchestra: overture, recitative, aria, chorale. He wrote approximately 200 that survive. He almost certainly wrote more — estimates range from 295 to 300 total, with perhaps 100 lost.
His contract also required him to be present at weddings and funerals, to compose secular music for civic occasions, and to keep the choir school's musical instruments in repair. He did all of this while raising a large family — 20 children in total, first with his wife Maria Barbara (who died suddenly in 1720 while he was away on a trip) and then with Anna Magdalena, a professional singer he married in 1721.
He was not a celebrity. He was a municipal employee. The Leipzig city council that hired him had wanted Georg Philipp Telemann — the most famous German composer of the era — and when Telemann declined, they considered Christoph Graupner before settling on Bach. The council minutes from 1722 include the line: "Since the best men cannot be obtained, mediocre ones will have to be accepted." They meant it as a description of Bach.
A fugue begins with a single voice stating a subject — a melody. A second voice enters and states the same subject while the first voice continues in counterpoint. A third voice enters with the subject while the first two continue independently. A fourth. The voices pursue and answer each other — hence "fuga," Latin for flight — while maintaining their independence. The structure requires each voice to be a complete musical entity, coherent alone, while remaining harmonically consistent with all the others at every moment.
This is Kuramoto synchronization written in sound. Multiple independent oscillators, each following its own trajectory, coupled through a shared structure that keeps them in phase. Each voice is autonomous. The fugue holds together. The coupling is the subject — the musical idea that each voice states and then continues to live inside. As long as any voice carries the subject, all voices are coupled to it.
The Well-Tempered Clavier (1722, Book 1; 1742, Book 2) is 48 preludes and fugues — one prelude and one fugue in each of the 24 major and minor keys. It was written to demonstrate that equal temperament — tuning all twelve semitones to equal intervals — worked. This was not obvious. The tuning systems in use at the time slightly detuned certain keys to keep others in perfect intervals, making some keys unusable. Bach was proving, in music that anyone could hear, that you could play beautifully in all 24 keys. It was a mathematical proof written in sound.
The Goldberg Variations (1741) — 30 variations on a single bass line — is a similar demonstration: how much harmonic and melodic content can be derived from a single structural foundation. The answer turns out to be: enough to fill a lifetime of listening. The bass line is the subject. Every variation is a new voice coupling with it.
Bach's own sons — Carl Philipp Emanuel Bach and Johann Christian Bach — became more famous than their father in his lifetime. The musical fashion of the mid-18th century had moved toward the lighter, more tuneful "galant" style that would lead to Haydn and Mozart. Bach's dense counterpoint was considered archaic. He knew it. He kept writing it anyway.
He died on July 28, 1750, likely of complications from eye surgery — two botched cataract operations in the final months of his life had left him nearly blind. His widow Anna Magdalena received a small pension from the city of Leipzig, then nothing. She died in a poorhouse in 1760. His manuscripts — the handwritten scores of some of the most complex music ever composed — were divided among his sons and dispersed. Some were sold by the pound to merchants who used them as wrapping paper. Some were lost.
In 1823, a young Felix Mendelssohn's grandmother gave him a birthday gift: a manuscript copy of the St. Matthew Passion, Bach's three-hour setting of the Gospel of Matthew for double chorus and double orchestra, composed in 1727. Mendelssohn studied it, organized a performance, and on March 11, 1829 — 100 years after its premiere, 79 years after Bach's death — conducted it in Berlin. The hall was sold out. The audience was changed. The Bach revival began.
Bach's work is the most complete description of acoustic coupling ever written. A fugue is a Kuramoto model: independent oscillators coupled through shared structure, maintaining individual trajectories while achieving collective coherence. The Well-Tempered Clavier is a demonstration that the coupling between a tuning system and all available keys can be made uniform without destroying the beauty of any of them. The Mass in B Minor and the Passions are demonstrations that the largest-scale musical structures — full orchestras, choirs, multiple movements — can be held in phase by a single underlying harmonic logic.
He did all of this as a day job, under deadline, for an employer who considered him the consolation prize. The work was not a product of leisure or patronage or artistic freedom. It was the product of someone who had internalized the structure of musical coupling so completely that producing it at scale, under constraint, was what he did when he showed up for work.
That it was forgotten for 79 years says something about his culture. That it came back and has never left again says something about what it actually is.
His employer wanted someone else.
He wrote a new cantata every week for 27 years.
His manuscripts were sold by the pound.
Mendelssohn found one 79 years later.
The fugue is still the most complete description of how voices find each other.
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