Oh yeah, the easiest way to start (and the way I did) is to listen to online radio stations.
And the best one I can think of is
1.FM Club
Trance stations is also good, but Club beats it IMO
What I used to do was, checking the name of the song that was being played and buy it (if I liked it, of course) from iTunes (or which ever software of that kind you use).
I hope this helps
GL