Classic Rock A-Z!

So my buddy and I are sitting in class, wondering if we could make an A-Z of Classic Rock artists. We got a bunch, but were wondering if anyone could add to the list. It is as follows: (Not in exact alphabetical order)
A: Aerosmith, April Wine, Alice Cooper, AC/DC.
B: Black Sabbath, Blue Oyster Cult, BTO, Bob Dylan, Byrds, Beatles, Billy Idol, Bob Seger, Bruce Springsteen, Bad Company, Boston, Bryan Adams.
C: Cream, Cheap Trick, Cars.
D: Doors, Def Leppard, Deep Purple, Doobie Brothers, Dire Straits.
E: Eric Clapton, Eagles, ELO.
F: Foghat, Foreigner, Free.
G: Guns N Roses, Grateful Dead, George Thorogood.
H: Heart.
I: Iron Maiden, Iron Butterfly.
J: Jimi Hendrix, Jethro Tull, Jefferson Airplane, Journey.
K: Kiss, Kansas.
L: Led Zeppelin, Lynyrd Skynyrd.
M: Metallica, Motley Crue.
N: Neil Young, Nazareth, Nirvana.
O: Ozzy Osbourne.
P: Pink Floyd, Peter Frampton, Police.
Q: Queen.
R: Rush, Rolling Stones, REM.
S: Styx, Scorpions, Steppenwolf, Steve Miller, Supertramp, Stevie Ray Vaughn.
T: Thin Lizzy, Tragically Hip, Trooper, Ted Nugent, Tom Petty.
U: U2
V: Van Halen, Van Morrison.
W: Who, War, Whitesnake.
X: (If anyone can find one)
Y: Yardbirds, Yes.
Z: ZZ Top.

Deserving entries will receive rep

 

Neither do I actually. I'm not quite sure what genre they fit under.

 

By the way, my buddy's heard of Frank Zappa (I haven't really, except in 'Smoke On The Water'), but doesn't really know anything he's done. What's he famous for?

 

Neither of those are classic rock bands.

 

Ok.