I'm working (still) on the c-minor fugue from the Well-Tempered Clavier, Book One. I started working on it around Thanksgiving (end of November for the international crowd), and about 3 weeks ago, I thought I had it pretty much nailed. I play about an hour a day, in 20-30 minute segments. In the last 2 weeks it's fallen apart.I find myself tripping over the descending scales, the thumb won't go where it went as recently as two weeks ago, and I've gotten sloppy. I feel as though I hit a wall with this piece and have bounced back.
Ok. Can you give details as to how you have been practising the fugue, for instance what size sections, what speed(s), hands together/separately, including details of how your practising changed as you became more acquainted with the piece. The answers may lie within.Meanwhile, I'll draw some likely conclusions beforehand. You say you are having difficulty with the descending LH runs, especially with the thumb. Have you looked at these sections HS, and then HT before putting the piece back together, for example? I look forward to hearing how you have been practising.
Could it be that you are putting too much of your energy into one thing, i.e. this prelude and fugue ? Variety is good for music, and it's possible to end up practising the act of "hitting the wall" itself rather than the act of playing the piece.Put simply, I would ease off on those pieces a little and inject some fresh variety into your practice with other things - improvisation perhaps ? Some jazz ?