[youtube=http://www.youtube.com/watch?v=BkH0cPzg-IU] Alfred Brendel playing Schubert’s Piano Sonata in B-flat, D. 960. Over the past few months, I’ve been going through a little bit of a gloomy period, and I think a big part of the reason why I was feeling melancholic was that I wasn’t playing or making as much music as I had been,…