Soma FM is one of my favourite things. Their stations are among my top listening while working. The lack of ads/interruption and excellently compiled playlists make for wonderful listening that truly augments my mood and ability to concentrate.
Another recommendation :
I used to listen to "Bluemars - Music for the space traveler" stream, but it has been defunct[0] for some time. However, it seems someone is trying to revive it there [1]. It is really great to use as background when coding. Eerie and inspiring.
They are amazing, and afaik live off of donations. As each of you guys discover Soma, please consider a small donation to the station to keep them going.