Here are two very different Internet Radio stations I've rediscovered lately - and neither has commercials or announcers.
I have a soft spot in my heart for Bollywood movie music. Best for people who don't mind mixing pop styles with Indian rhythms. Good thing I can't understand the words. Bollywood Music Radio
Radio Darvish plays traditional Persian Music. Geographically I guess that's not so far from India - a few time zones. Musically this is quite a distance.
While we're on the subject of Persian music, might I suggest The Hidden Sacred, an album by the group Dark Wing (which includes my friend, percussionist and composer David Johnson). Hearing this album performed live was a highpoint of my Christmas-season music. David's site is here, Lian Records sells them.