A mix of industrial, classic rock, hard rock, various classes of metal (though little of this new stuff, little black metal, and no gothic metal), jazz, Deutschrock, Russian/German marches and folk songs, and, of course, classical works.

My favourite bands/artists include:
AC/DC
Die Toten Hosen
Schweisser
Böhse Onkelz
BAP
Die Ärzte
Kaizers Orchestra
Red Hot Chilli Peppers
Iced Earth
Iron Maiden
Blind Guardian (some great LOTR themed songs)
The Beatles


This is but a small selection of what I listen to, however.