LOL, farmgirl...I can't wait to see Tool. I've heard the visuals are very unusual as well, the artwork and all...As for the question...Man, this is really too hard to pick, but here are the ones I've really been into, by era because I'm old
In no particular order:
Led Zeppelin
Pink Floyd
The Beatles
Hendrix
Yes
Neil Young/CSN/CSNY (ok, that was six)
U2
Springsteen
Metallica
R.E.M.
Alice In Chains/Jerry Cantrell
Tool/APC
Pearl Jam
Soundgarden/Chris Cornell
Nirvana
Creed
Chevelle
Audioslave
Mars Volta
Dust For Life