Bach Wrote 1,000 Works You’ll Never Hear — Here’s What Happened to Them

Welcome to LivingPianos.com. I’m Robert Estrin. You think you know Johann Sebastian Bach through masterpieces like the Well-Tempered Clavier, the Goldberg Variations, the St. Matthew Passion, and the Brandenburg Concertos. But there is something almost nobody talks about, and it is truly astonishing.

Nearly Half of Bach’s Music Is Gone

Almost half of everything Bach ever wrote is lost. Bach’s manuscripts were destroyed, sold off, scattered, and in some cases possibly even used as wrapping paper. Here is the number that stopped me cold when I first learned it: the music we have lost from Bach is almost certainly greater in total volume than everything Mozart composed in his entire lifetime! It may sound unbelievable, but the numbers are real. Scholars estimate that somewhere between 40 and 50 percent of Bach’s total output is missing. That could mean roughly 700 to 1000 works gone.

The Missing Cantatas and Passions

Bach was one of the most prolific composers who ever lived. He wrote five complete cycles of church cantatas, about 300 in total, covering nearly every Sunday and feast day of the Lutheran calendar. Today, we only have three of those cycles. Two entire cycles, around 100 to 120 major choral works, are simply gone.

Then there are the passions. Most people know the St. Matthew Passion, and many know the St. John Passion. But Bach almost certainly wrote at least four passions. We still have the text of the St. Mark Passion, but not a single note of the music survives. There was likely a St. Luke Passion and at least one more as well. These were not small works. The St. Matthew Passion alone takes nearly three hours to perform. Imagine several more works of that magnitude that have completely disappeared.

The Lost Instrumental Works

During Bach’s time working for Prince Leopold, he was freed from church obligations and focused on instrumental music. This period gave us the Brandenburg Concertos, the cello suites, and the violin partitas. So what else did he write during this time? Almost certainly much more. Additional concertos, sonatas, and chamber music. We have hints, references, and fragments, but much of the music itself is gone.

How Did This Happen?

When Bach died in 1750, his manuscripts were divided between his sons. Carl Philipp Emanuel Bach understood their value and preserved everything entrusted to him. We owe him an enormous debt. But Wilhelm Friedemann Bach, though exceptionally gifted, struggled with financial hardship. Over time, he sold off many of his father’s manuscripts. Original scores in Bach’s own hand were dispersed, lost, and in some cases vanished entirely.

There are even stories, disputed but not dismissed, that some manuscripts were used by shopkeepers as wrapping paper for butter and meat. Not long after Bach’s death, his music was considered old-fashioned. Sometimes the paper itself was valued more than the music written on it.

The Bach Revival

The story takes a remarkable turn nearly 80 years later, when a young composer changed everything. Felix Mendelssohn had grown up with Bach’s music. His grandmother gave him a manuscript copy of the St. Matthew Passion. In 1829, Mendelssohn conducted the first public performance of the St. Matthew Passion since Bach’s lifetime. After nearly 80 years of silence, audiences were overwhelmed and critics were stunned. That performance helped launch what we now call the Bach revival.

Mendelssohn later became deeply connected to Leipzig, where Bach had spent the last 27 years of his life. He championed Bach’s music and helped inspire the founding of the Bach Society in 1850, exactly 100 years after Bach’s death. Their mission was to find, collect, and publish every Bach manuscript they could. The project took 50 years, and even then, some works could not be found.

Comparing Bach and Mozart

Mozart died at just 35 years old and left behind more than 600 works, an astonishing output. His complete surviving music adds up to around 200 hours of listening time. Bach’s lost music may well exceed that. The missing cantata cycles alone could amount to dozens upon dozens of hours. Add to that the missing passions, concertos, sonatas, and even works we do not know ever existed because no record of them survives. The scale of this loss is almost impossible to grasp.

New Discoveries Even Today

There is a hopeful side to this story. Bach can still surprise us. Even in recent years, researchers have identified previously unknown works as authentic Bach compositions. Pieces that sat unnoticed in libraries or archives for centuries are still being discovered. This means not everything is necessarily gone forever. Some music may still be waiting in a manuscript folder, an archive, or a private collection, unrecognized for what it truly is.

Reflecting on What Remains

What we do have from Bach is among the greatest music ever written, and certainly one of the most extraordinary bodies of keyboard music in history. Having spent a lifetime studying and performing this music, it is impossible not to think about what was lost. Not with despair, but with wonder. If what remains is this extraordinary, what must the rest have been like?

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