My most favorite classical song is either Moonlight sonata- Beethoven or Canon in D by- Pachelbel.

Some fun instrumentals are Satch boogie, super colossal, midnight- Joe Satriani, far beyond the sun- Y. Malmsteen, Blue Sky (guitar solo)- allman brothers, Free bird (guitar solo)- Lynyrd Skynyrd (a great song to jam to). there are MANY others.