Tchaikovsky's 5th symphony is a classic, Verdi's requiem is very good and pretty much anything by mahler. Also Dvorak's cello concerto and 7th symphony.
Dvorak's "A New World"
Mozart's "Ave Verum Corpus"
Mozart's "Requiem"
Beethoven's "Moonlight Sonata"
Bach's "Cello Suite No. 1 in G"
Chopin's "Nocturne in E flat"
Bolero's "Ravel"
Aaron Copeland's "Appalachian Spring" (or at least "Simple Gifts")
Samuel Barber's "Adagio for Strings"
Grieg's "Peer Gynt"
Offenbach's "Barcarolle"
Saint-Saen's "Dance Macabre"
Erik Satie's "Gymnopie #1"
Delibes' "Flower Duet" from his Lakme opera
The Hero soundtrack
ANY Shostakovich is very YES!! The 8th string quartet is so amazing. It's driving music for me. I just stick it on, roll down the windows, and go. the 2nd movement is my favorite.