Taproot w/ dredg was the shit.
Uh...System of a down w/ sevendust and rob zombie was cool....
Les Claypool was the shit...
A Perfect Cirlce, Incubus, Audioslave were cool as fuck....um I'm sure there's more but I forgot them...
I've actually done a bit of research on the subject and here is what i've found.
The large drug corporations pay millions and millions of dollars to lobbyists (and congressmen under the table, but they won't admit that!) in order to keep weed illegal. They would much rather have you pay...