FirstLook.com has tons of hit singles available online, complete with rankings and ratings. You can preview tunes and purchase them (for a handful of pennies) on a per-listen basis. They had one DB song available, and here it is:
39     David Bowie     Seven
A powerful release from David Bowie.
(Advertiser Cost $ 0.04)
Go to FirstLook.com
from BNet teenage corrospondant, A_Girl