Lots of great instrumentals out there if you know where to look. Favorites are by Rush, some good ones by Steve Howe (Yes) and of course, Mason Williams.
I know, drums... I count them considering this in one of the only drummers who "composes" on a drum kit...
[ame="http://www.youtube.com/watch?v=GHkucr1jJpQ"]YouTube- Neil Peart Drum Solo - Rush 30th Anniversary - HD[/ame]
Live Rush just has so much more energy than the studio versions...
[ame="http://www.youtube.com/watch?v=xjglB04TOno"]YouTube- La Villa Strangiato (Rush in Rio)[/ame]
[ame="http://www.youtube.com/watch?v=jKBLSkN2sRk"]YouTube- YYZ[/ame]
[ame="http://www.youtube.com/watch?v=8WrMkvhX8Rg"]YouTube- Rush - Leave That Thing Alone 3-22-1994[/ame]
Steve Howe, for all you "whipper-snappers" out there is a phenomenal classical guitarist in his own right, but also known for being the guitarist for Yes.
[ame="http://www.youtube.com/watch?v=M1ZmIFR4Sc0"]YouTube- Steve Howe - Clap + Mood for a day[/ame]
[ame="http://www.youtube.com/watch?v=lj-k2PNFl2w"]YouTube- Steve Howe - Sketches in the Sun[/ame]
Mason Williams... Lisa Simpson can apparently play this song (earlier episode where they strike for health benefits)
[ame="http://www.youtube.com/watch?v=cgUql7E7S-k"]YouTube- Mason Williams - Classical gas[/ame]