Pink Floyd, Queen
Stone Temple Pilots, The Smashing Pumpkins, Beck, Queens of the Stone Age
deadmau5, Aesop Rock, Madeon
Classic rock; Zeppelin, Cream, Hendrix, Queen, The Doors, Derek and the Dominoes, Moody Blues, Pink Floyd, Yardbirds, ACDC
New/Alternative rock; Queens of the Stone Age, Nirvana, Soundgarden, Radiohead, the Strokes, Pearl Jam, Screaming Trees (and Mark Lanegan, solo), Alice in Chains, Guns N Roses
Older music; Instrumentalists (Tommy Dorsey, Artie Shaw, Duke Ellington, etc), Vocalists (Frank Sinatra, Bing Crosby, Nat King Cole, Peggy Lee, Dean Martin), Groups (Sinatra & Dorsey Orchestra, Ink Spots, Andrew Sisters)
I can tolerate/enjoy most of the alternative stuff on nowadays (Arctic Monkeys, Kasabian) and almost all classic rock from the 50s-70s, but when it comes to country/hip-hop/modern pop, there's no love lost.
Never really did like any modern present-day "rock" which usually turns out to be the latest hipster circle jerk. Limp-wristed, Beatles wanna-be garbage, all of it. Same thing with present day hip hop, which is little more than autotuned retardartion. Many of my other favorite genres, such as funk and jazz are almost non-existent currently.
It's all about music from the 1990's on earlier.
I would suggest giving a listen to Songs for the Deaf, Rated R (Both QotSA), or Is This It (Strokes). The saving grace of 21st century music in my opinion. Although yes, generally the mainstream taste in music has reached a low point.