Is it the one that can be heard in Tom&Jerry?
I like Liszt anywway.

beethoven symphony 7 2nd movement (cliche but amazing)
dvorak-slavonic dances, 7th symphony
mahler-1st
brahms-3rd
bach-harbsichord concerto-i forget which one
wagner overtur to tristian
motzart-requiem
there is so much...
theres also some really cool middle ages and renissance music