Most of it, rather, for this concert (15 in total): C, c, C#, c#, D, d, F#, f#, G, g, A-flat, g#, A, a, b.
So, my performance project this past year was WTC I, which I played in a number of formats - 12-15 as a lecture-recital, a "best of" (usually about 15-17, lasting 80 minutes), or the whole thing top to bottom (which I only did a few times and it absolutely slayed me). It was a very difficult project, but beneficial and revealing in many ways. It's been a long time since I've played one of these publicly, so part of the challenge was teaching myself how to do if again after spending so much time recently on more extreme contemporary repertoire. I don't think I'll try Book II anytime in the near future since I would like to move on to other projects.
This concert was presented at the University of Memphis' "Piano Plus" Series in February. The link is queued up from the recital portion; watch from the beginning if you want to listen to me make some nerdy jokes in the lecture. Playing Bach in public is exceedingly hard, and I manage to hit at least one hilariously wrong note per piece, but whatever.https://youtu.be/0Ak2BNhjO30?t=42m30s