How can I listen to free online music while performing other tasks on my device? I have Android 2.2 on my phone and I want an app that lets me listen to free music online in the background while I browse through other apps or do something else on my phone.
The YouTube app closes once I minimize it, so I have to keep it open to listen to music.
I have tried apps like Shazam and Soundhound but they don't offer free music. Can anyone recommend a good app?
I heart Radio and TuneIn Radio are apps that let you stream FM radio stations.  You select the sort of station you like and listen to the music they play. 

I personally use them for listening to talk radio, but same difference.