Surprising Omissions

Whether it's due to their reputation/influence, their considerable record sales, their longevity or sheer prolific output, I am surprised that the following artists are not represented on any of the reputation/critic-based criteria:

Bad Religion
any Ben Folds project
Bikini Kill
Blue Oyster Cult
Bright Eyes *
Built To Spill
Charlie Parker
Cher
Crass
Daniel Johnston
Dave Matthews Band *
the Decemberists *
the Doobie Brothers
Garth Brooks
Gnarls Barkley
Heart
the Hollies
Hootie and the Blowfish
any Jad Fair project
Jandek
Joe Jackson
John Denver
John (Cougar) Mellencamp
Journey
Kenny Rogers
KMFDM
Lead Belly
any Les Claypool project, but especially Primus
Louis Armstrong
Melvins
the Misfits
Modest Mouse *
The Moody Blues
Negativland
Ozzy Osbourne (solo)
Pete Seeger
Phish
Placebo
Rancid
Rilo Kiley
Roy Orbison
the Shins *
Spoon
Sting (solo)
Stone Temple Pilots
Styx
Sublime
They Might Be Giants
Tool
Warren Zevon
Woody Guthrie *
Yo La Tengo

*these are included in the mission due to recommendations from friends and family

PS: I'm sure some of the items on this particular list give away the generation I lived in or my own personal taste in music.  coughsublimecoughnegativlandcoughrespectivelycough.  So, yeah.  We don't need to discuss that.