Bach, Mozart, Stravinsky, Rachmaninov, Liszt, Chopin, Beethoven, Tchaikovsky, Vivaldi (when he's not repeating himself), Grieg, Sor, Tarrega, Bizet, Rossini, Puccini, Schubert, Schumann, the list goes on.

I'm not a big fan of the more boring composers like Paganini or Debussy.