Bach Wrote 1000 Works You Will Never Hear — Here is What Happened to Them

The lost works of Bach exceed Mozart's entire output.

I'm Robert Estrin and this is LivingPianos.com. You think you know Bach, the Well-Tempered Clavier, the Goldberg Variations, the St. Matthew Passion, the Brandenburg Concertos. But here's what almost nobody talks about. Almost half of everything Bach ever wrote is gone, lost, destroyed, sold off, scattered, maybe even used as wrapping paper. Here's 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. Let that sink in. Now you might think that just sounds like clickbait. It isn't. The numbers are real. And the story of what happened to Bach's music tells us something profound about how fragile greatness can be. Scholars estimate that somewhere between 40 to 50 percent of Bach's total output is missing. That could mean roughly 700 to 1,000 works gone.

Bach was one of the most prolific composers who ever lived. He wrote five complete cycles of church cantatas. Five! That is about 300 cantatas covering nearly every Sunday and feast day of the Lutheran calendar. And today, we only have three of those cycles. Two entire cycles simply do not exist anymore. That means somewhere around 100 to 120 major choral works are gone. And it gets even more heartbreaking.

Take the Passions. Most people know the St. Matthew Passion. Many people know the St. John Passion. But Bach almost certainly wrote at least four Passions. There was a St. Mark Passion. We still have the libretto, the text, but not a single note of the music survives.

There was likely a St. Luke Passion and at least one more beyond that. These were not small works. The St. Matthew Passion alone takes nearly three hours to perform. Imagine several more works of that scale simply gone.

Then there's Bach's Köthen period. This is when he worked for Prince Leopold and he was free from church obligations. That gave him the opportunity to focus on instrumental music. This is the period that gave us the Brandenburg Concertos, the Cello Suites, the Violin Partitas. So what else did he write then? Almost certainly a great deal more. More concertos, more sonatas, more chamber music. We have hints, references, fragments, but much of the music itself is gone. So what happened? When Bach died in 1750, his manuscripts were divided between his sons.

Carl Philipp Emanuel Bach understood what he had. He preserved everything entrusted to him. And we owe him an enormous debt for that. But Wilhelm Friedemann Bach, his eldest son, had a very different life. He was gifted, exceptionally gifted, but he struggled. Debt, financial hardship, a life that never fully came together. And piece by piece he sold off his father's manuscripts, original scores in Bach's own hand, sold to collectors, dispersed, lost. There are even stories, disputed but not dismissed, that some original Bach manuscripts were used by shopkeepers as wrapping paper for butter and meat. Think about that.

Not long after Bach's death, his music was considered old-fashioned. The paper itself was sometimes valued more than the music written on it. But here's where the story turns.

Almost 80 years after Bach died, when he was nearly forgotten, a 20-year-old composer changed everything. Felix Mendelssohn. That's right.

Mendelssohn had grown up with Bach's music. His grandmother had given him a manuscript copy of the St. Matthew Passion and in 1829 Mendelssohn conducted the first public performance of the St. Matthew Passion since Bach's own lifetime. Nearly 80 years of silence and then this. The audience was overwhelmed. Critics were stunned. That single performance helped launch what we now call the Bach revival. The musical world rediscovered Bach. Mendelssohn later became deeply connected to Leipzig, the city where Bach spent the last 27 years of his life as Thomaskantor at St. Thomas Church. Mendelssohn founded the Leipzig Conservatory there. He championed Bach at every opportunity and because of efforts like this, the Bach-Gesellschaft, the Bach Society, was founded in 1850, exactly 100 years after Bach's death.

Its mission was simple. Find every Bach manuscript, collect it, publish it, preserve it.

That project took 50 years and even then, with all the scholarship and all that searching, there were still works they could not find.

Now let's bring in Mozart.

Mozart died at 35 and left behind more than 600 works, an astonishing output. Symphonies, concertos, operas, chamber music, piano sonatas. In total listening time, Mozart's complete surviving output adds up to around 200 hours of music, and Bach's lost music may well exceed that. The missing cantata cycles alone could amount to dozens upon dozens of hours, and then add the missing Passions, the lost concertos, the lost sonatas, and think about the works we did not even know to miss because no record of them even survives. The scale of this loss is almost impossible to grasp.

But here's the hopeful part. Even now Bach can still surprise us. In late 2025, researchers in Germany identified two previously anonymous organ works as authentic Bach compositions, a Chaconne in D minor and a Chaconne in G minor. They've been sitting in a library unattributed and now they have been recognized. That's extraordinary because it means this still happens every so often. A library, an archive, a private collection turns up something new, so maybe not everything is gone forever. Some of it may still be waiting in an archive, in a manuscript folder, in a private collection whose owner has no idea what is actually there.

What we do have from Bach is among the greatest music ever written, certainly the greatest body of keyboard music ever written, and as someone who has spent a lifetime playing his music, studying it and living with it, I find myself thinking not only about what survived but about what was lost, and not with despair but with wonder. If what remains is this extraordinary, what must the rest have been like?

If you love Bach, I would love to hear your thoughts in the comments and subscribe if you haven't already because we go deep into piano music here in ways you will not find anywhere else. I'm Robert Estrin, you're watching LivingPianos.com. Keep playing!

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