Basically what the title says. But you can say what genre, band, artist, song, etc.
My top 10 bands/artists are:
1. Volbeat
2. Disturbed
3. Godsmack
4. Metallica
5. Motley Crue
6. AC/DC
7. Tenacious D
8. Avenged Sevenfold
9. Eminem
10. FFDP.
And my favorite song right now is 115 from Black Ops...