Web sites where you can download Regular tracks:

AudioLunchbox
Emusic
Apple iTunes
BuyMusic
MusicMatch
Rhapsody
NetMusic
DiscLogic
Napster
Music4Cents
Etherstream
RuleRadio
QTRnote
EMEPE3
CatchMusic
Sony Connect
Puretracks
MSN Music
MusicNet
LoudEye
Mperia
OnlinePromo
DigiPie
MusicNow
iSound
MP3tunes
PlayIndies