Many of us think the radio is for the car, or background music while at home, but do not think of listening to the radio on the Internet. Some internet radio stations require free signup, some require nothing but your ears. Since these are Internet based, they are available on your PC, tablet, smartphone, etc. A few require an app for your phone, but most are just available as a web site.
Below are a few free (most accept donations) stations you can tune
into while derping around the net. You can find many more by
Googling "Internet Radio Stations."
Many genres available, but some have commercials embedded - http://www.internet-radio.com/
Large collection of stations - http://www.sky.fm/
Smartphone favorite - http://www.pandora.com/
Very cool option to check real radio stations that also broadcast
live. Check by hometown, country, or genre. http://radio-locator.com/
Was going to add links to specific stations, but thought why
limit you to my musical proclivities. Enjoy!