Many of my students often ask what music I listen to, and what classical music I would recommend.  Below, you can find a list of some of my favorite pieces:

Symphonies No. 3, 5, 6, 7, 9 by Beethoven

Requiem by Mozart

Symphonies No. 1, 2, 4 by Brahms

Symphony No. 5 by Tchaikovsky

Rite of Spring by Stravinsky

Applachian Spring by Copland

String Quartet No. 8 by Shostakovich

Til Eulenspiegel by Richard Strauss

New World Symphony by Dvorak

Six Sonatas and Partitas for solo violin by J.S. Bach (these are unaccompanied, so you will literally only hear a violin)

Concertos for Violin and Orchestra Nos. 3, 4, or 5 by Mozart

These are just a few to get you started in your listening.  I'll be happy to change the playlist in a few months when studenst have had time to go through it.  Happy listening!