ARCHIVE 024: FINETUNE DOT COM

This is an incredible self-customizable-good-design-internet radio. It's a little hard to find really underground songs, but anyway there are many many songs in here. Of course these songs are full-length, and this service is completely legal, whatever.
But you gotta select 45 songs though (if you push the button "I'm lazy", then the list will be filled automatically).
Try!
finetune.com