This is a really hard one to narrow down, probably Brahms and/or Beethoven.
Favorite solo piece
Again hard to choose one, my favorite piano concerto is Brahms' Second Piano Concerto. I love to play any Brahms symphony, and there are so many other pieces I love to play and listen to.
Other than classical music _____ is on my iPod
Exercise (walking) music including a variety of styles, but all with a good beat