My friends and I have worked here and there over the past year creating a fully featured custom radio station for GTA V. We have fully implemented DJs, custom commercials, station bumps, music, talk segments, etc. We think it turned out well and had a lot of fun making it. Check it out and let us know what you think!
[NOTE: There's some offensive material that doesn't represent our views, but more so the comedy of the game and bigotry of the stereotypes we were trying to represent.]
[!!NEW!!] It's finished! Click here to preview and download. I split it up into several different tracks to assist in the randomness of the starting location. This seems to be the best way. Check out the 00-Readme.txt file if you're not sure how to add custom stations to GTA V. Be sure you have the Radio mode set to sequential.
Here's the original commercial for Coal Rollin Radio:
I will be updating this thread with new development of the station as they are available. Stay tuned.