One of the cool things about GTA 5 PC is the ability to play your own music; and not in the usual way of turning down the audio and cranking Spotify in the background. "Self Radio" is GTA 5's music player, and, much like GTA 4, it integrates your tunes into a new radio station, complete with chatter between songs.
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How do you set it up, then? For all of GTA 5's many tutorial boxes, it doesn't obviously outline the process. Luckily, it's a pretty painless procedure.
First things first, you'll need some music. Finding what file formats GTA 5 supports is a little tricky, but, if we use GTA 4's Independence FM as a guide, you should be okay with MP3, M4A and WMA. Now find the User Music folder. It's in your user profile, in '\Documents\Rockstar Games\GTA V\'. Next, copy (or move) the music into the folder.
In-game, GTA 5 should automatically find your music and add Self Radio as a new station. If it doesn't, head into the game's settings menu, and open the Audio tab. In there, you'll be given the option to perform a 'Quick' or 'Full' scan. Also in the options menu, you can change how Self Radio plays—either keeping it as a traditional radio station, or simply playing your music sequentially or in a random order.