Hmm, let's see... some bands I do like though I've heard one CD from them (I think it's only one, or two):
- Led Zeppelin
- Pink Floyd
- The Doors
- Yes
- King Crimson
- Megadeth
- Dream Theater
- Emerson Lake & Palmer (Only heard one CD from them: Trilogy, a very good CD)
- Crusis (band from...