My favourite artists would be: AC/DC, Guns N' Roses, Alice In Chains, Metallica, Megadeth, Wolfmother, Def Leppard, Aerosmith, Alice Cooper, The All-American Rejects, Audioslave, Avenged Sevenfold, Beastie Boys, The Beatles, The Black Keys, Black Sabbath, Blink 182, Bloc Party, Blue Oyster Cult, Blur, Bon Jovi, Buckethead, Bullet For My Valentine, The Clash, Coldplay, Daft Punk, Deadmau5, Deep Purple, Dio, Dokken, The Doors, DragonForce, Dream Theater, Duran Duran, Eric Clapton/Cream, Extreme, Faith No More, Foo Fighters, Gorillaz, Green Day, Grinspoon, Hanoi Rocks, The Hives, Iron Maiden, Jane's Addiction, Jet, Jimi Hendrix, Joe Satriani, Judas Priest, The Killers, Kingswood, Kiss, Led Zeppelin, Linkin Park, The Living End, Motley Crue, Muse, Nine Inch Nails, Nirvana, Oasis, The Offspring, Ozzy Osbourne, Pantera, Pearl Jam, Pink Floyd, Poison, Powderfinger, Queen, Queens of the Stone Age, Quiet Riot, Radiohead, Rage Against The Machine, Rammstein, Ratt, Red Hot Chilli Peppers, The Rolling Stones, Scorpions, Skid Row, Slash (his solo stuff is excellent), Slash's Snakepit, Smashing Pumpkins, Soundgarden, Stone Temple Pilots, System of a Down, Them Crooked Vultures, U2, Van Halen, Velvet Revovler, The Who, Whitesnake, ZZ Top.
Now out of those, my most favourite are AC/DC, Guns N' Roses, Alice In Chains, Metallica, Wolfmother, Black Sabbath, Dream Theater, Green Day, The Hives, Iron Maiden, Jane's Addiction, Ozzy Osbourne, Pearl Jam, Queen, Rage Against The Machine, Red Hot Chilli Peppers, Slash, System of a Down, Van Halen, U2, Velvet Revolver.
Yes, I know I like a lot and have trouble narrowing down choices lol.