Zeppelin, Zeppelin, and more Zeppelin.

Having gotten past that:

Weird Al Yankovic, ABBA, AC/DC, Audioslave, B.B. King, The Beach Boys, The Beastie Boys, The Beatles, Beck, Bee Gees, The Black Crows, Black Sabbath, Blondie, Blue Oyster Cult, Bob Dylan, Bob Marley, Bon Jovi, Brian Wilson, Buffalo Springfield, The Byrds, Cake, The Cardigans, The Cars, The Coasters, Coldplay, Collective Soul, Cracker, The Cranberries, Crash Test Dummies, Cream, Creedence Clearwater Revival, The Cure, Cyndi Lauper, David Bowie, Def Leppard, Depeche Mode, Devo, Dire Straits, The Doors, Dusty Springfield, The Eagles, Elmore James, Elton John, Elvis Presley, Emerson, Lake & Palmer, Eric Clapton, Etta James, Fiona Apple, Fleetwood Mac, Foo Fighters, Frank Sinatra, Frank Zappa, Garbage, Gary Numan & Tubeway Army, George Gershwin, George Harrison, George Thorogood, Gin Blossoms, Green Day, Guess Who, Guns 'n' Roses, Hayseed Dixie, Howlin' Wolf, James Brown, James Taylor, Jane's Addiction, Janis Joplin, Jeff Beck, Jet, Jethro Tull, Jimmy Hendrix, Jimmy Buffet, Joe Pass, John Fogerty, John Lennon, Johnny Cash, Joni Mitchell, Judas Priest, The Kinks, Kraftwerk, Leadbelly, Led Zeppelin (duh), Live, Living Colour, Louis B. Armstrong, The Mamas and the Papas, Martha & the Vandellas, Miles Davis, The Monkees, Nancy Sinatra, Neil Young, Nina Simone, Nine Inch Nails, Nirvana, No Doubt, Nouvelle Vague, Oasis, The Offspring, Ozzy Osbourne, Paul Simon, Pearl Jam, Pink Floyd, The Police, The Pretenders, Prince, Queen, R.E.M., The Rancoteurs, Radiohead, Ray Charles, Red Hot Chili Peppers, Richard Wagner, Rick James, Right Said Fred, Robert Johnson, The Rolling Stones, Roy Orbison, Sam the Sham & The Pharoahs, School of Fish, Sheryl Crow, Simon & Garfunkel, Sir Mix-a-lot, Smashing Pumpkins, The Smiths, Social Distortion, Soft Cell, Sonic Youth, Soundgarden, Steve Miller Band, Stone Temple Pilots, Syd Barrett, Talking Heads, Tears for Fears, Tenacious D, Thelonious Monk, Tom Petty, Traffic, Train, The Turtles, U2, Van Halen, The Wallflowers, Warren Zevon, The White Stripes, Whitesnake, The Who, Wild Cherry, Willam Shatner, The Yardbirds, The Zombies