Pretty much anything that sounds good. I was raised on classic rock. Evertything from Led Zeppelin and Black Sabbath to Elton John and Billy Joel. My music collecition is pretty eclectic. Majority of my music is Rush, Led Zeppelin, The Yardbirds, Cream, The Doors, The Who, Black Sabbath, Queen, Robert Johnson, Johnny Cash, Hank Williams, Hank Williams Jr., and all the way to Frank Sinatra, Elvis, Beethoven, Bach, and Wagner. Yup, I like good classical music as well. Now the majority of the stuff on my iPod, especially when it comes to training is metal/hard rock. Marilyn Manson, Stonesour, Nonpoint, Nine Inch Nails, Alice In Chains, etc.