I don't know if its a guilty pleasure but i love Jeff Buckley's music, he's such a great musician, shame he's not still here...
Doing Advanced Music and Music Extension classes in my final year of high school (yr 12 in Australia), i have to listen to LOTS of different music, from Baroque to contemporary music (i even was able to do an assignment on Alternative Rock and Stand Inside Your Love

), and i surprisingly have come to like so much music i would never have thought i would(provided its good), my parents are shocked when i come home and put on something like Chopin or Vivaldi... i think thats quite funny, this 17yr old rock-lovin-guitarist listenin to that sorta stuff
I love playing jazz, not your typical jazz but more the nice guitar stuff with chord voicing and that stuff, i'd never thought i'd be listening to let alone playing that sort of stuff a few years ago, so i guess thats a guilty pleasure