M.L.
Here is a great website I found while training for the 2 marathons I ran earlier this year. You can choose songs by pace/genre/etc (I did the 26 mile runs at about a 9 min pace, so I used that for my guide). When I do shorter/faster runs, I use something around an 8 min pace.
Hope this helps: http://jog.fm/. Good luck with the running. I started up after my daughter was 6 months (she will be 3yo next week) and since I have run 2 marathons, 3 1/2 marathons and am training for 2 more 1/2 marathons this fall and winter.