It is so hard to pick just 10 but here are the first 10 that come to mind:

1. Yes
2. Genesis with Peter Gabriel
3. Weather Report (with Jaco & Wayne Shorter)
4. Steely Dan
5. Paul Westerburg
6. Tom Waits
7. Porcupine Tree
8. Jethro Tull
9. Joni Mitchell
10. Peter Gabriel