Having been inspired by the randomiser I am think even more can be found about people by seeing their most played songs on their MP3 players. I always try to grab family and friends ipods to check out what they really like. This has caused problems - my youngest brother scarily had Katie Melua's cover of Just Like Heaven in his top five which reflected badly on me as an older brother.

Mine are:

Traffic - Can't Find My Way Home
The Velvettes - He was really saying something
Fleetwood Mac - Tusk
Paul Williams - You give a little love (from Bugsy Malone - it is truly the greatest song ever though)
Richard and Linda Thompson - I Want to see the bright lights tonight