I listen to internet radio often. Also SimplyNoise’s app is helpful for drowning out those pesky crappy thoughts.
Some of my favs which I found using the itunes radio station thingy under ambient radio stations are:
Any of the CBC Classical Stations, DroneZone, Space Station Soma, Still Stream, Digitally Imported has several good stations.
I just find sometimes silence is a killer for a busy mind like mine. All of these have apps too! Try it out when reading, studying, stretching. I specifically like them because they have no lyrics so I am not busy trying to analyze lyrics which I do constantly when listening to music.