I'm taking on Huck's challenge:
Alice in Chains and Anthrax
Bob Marley and Black Sabbath
The Clash and The Cars
Deadmau5 and Dream Theater
ELO and Eminem
Foo Fighters and Frightened Rabbit
Gojira and GZA
Hardwell and I don't even know
Iron Maiden and Intronaut
Jimi Hendrix and Johnny Cash
Katatonia and KoRn (I like their old shit, sue me)
Led Zeppelin and Less Than Jake
Mastodon and Metallica/Mew (too close to decide)
Notorious B.I.G. and Ned's Atomic Dustbin
Opeth and Ozzie Osborne?
Pearl Jam and Pink Floyd
Can't think of any Q bands lol
Rage Against the Machine and Russian Circles/Rush (too close)
Smashing Pumpkins and way too many ties for 2nd (Slipknot, STP, Soundgarden, Slayer, etc.)
Tesla and Them Crooked Vultures (t-bands were pretty thin)
U2 and idk
Van Halen and The Vandals
Wolf Parade and We Were Promised Jetpacks
Idk any X-bands off the top of my head
Yes and Yellowcard
ZZ Top and idk
#s: 2Pac and 50 Cent hahaha
Did this without looking, your turn.