We know that most of his performance was done using meantone systems, like the rest of his contemporaries. They are are quite precisely known. What his well tem

We know that most of his performance was done using meantone systems, like the rest of his contemporaries. They are are quite precisely known. What his well tempering might have been is a matter of conjecture and many fascinating proposals have been put forward. I had a great time playing in the orchestra for the Bach 4 harpsichord concerto trying out one particularly wild experiment.