I listen to a wide variety of music, and actually perform classical music (viola) with a local symphony... but to be honest, I only listen to classical when I'm studying a current piece. Usually I listen to '90s grunge/alternative, classic (primarily '70s) rock, and select "top 40" songs. Sadly my favorite band of all time, R.E.M., just announced their breakup - so I'm still in a bit of mourning over that. Some of my other favorites:

Nirvana
Red Hot Chili Peppers
Pink Floyd
The Pixies
Grateful Dead
John Lennon
Elton John
Billy Joel
Santana
Bob Marley
Stevie Ray Vaughan
The Rolling Stones
Sublime