Pop. I love it. Mainstream pop. I'm much more tolerant of it these days, and I really enjoy it (like Shakira, Lady Gaga <3<3, Beyonce <3, Nelly Furtado, Britney Spears, new artists like Addictiv and Elise Estrada). Next would be techno/dance/Electronic (stuff like MGMT, I guess? And I always listen to the live broadcasts of radio stations, when they have DJs mixing songs together) and then old/classic rock, stuff like Nirvana (is it old yet? xD), Van Halen and, of course, the Beatles. (Eee! The Beatles! lol)
I also like hip-hop, new and old (ex: Beastie Boys, Run-D.M.C., Ludacris... yeah, anything catchy).
Some of my current favourite artists atm are 3oh!3, The New Cities, Stereos, Boys Like Girls (okay, only about one song...), etc.
Man, I hate how Paparazzi is abused on the radios these days. I remember how I'd listen to it so much last year on imeem. I really want the old version of Beautiful Dirty Rich; I love that song.