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@Aquamarina It's for easier on-demand additions. Instead of manually navigating around you simply right-click any .mp3 or .flac audio file (or shortcut to one) and just click a button to add it to GTA V.
I wouldn't view this as a mod, but rather a tool. Hence why it's in the "Tools" category.

@JIV-A To enable radio station ingame, check out this video:
https://www.youtube.com/watch?v=LUpft6F83uQ

The settings you need are in the start of the video.

@tomrompush navigate to:
my documents\Rockstar Games\GTA V\User music
And delete the song you added

@DeadSonRIsingxD ^

I don't know why that is happening :/
You can run the troubleshooter and mail me the results (rainbawz@derpymail.org) if you'd like, as that'd be the only way I could find out what's going wrong.

v1.7 is in the making, it will include a playlist feature, allowing you to create and toggle between playlists. Stay tuned!

@Wunderbaum Stemmer

@ShadowHunter9x I'm unable to test the program with iTunes on my own system as its installer fails every time I try to install it. Sorry.

@ShadowHunter9x What is your default media player? (If you don't know you can run the troubleshooter program located in the "Tools" folder, it'll generate a text file that contains information about the media players currently installed on your system.

@Fan of Saints Right-click the program file and choose edit. Remove the line saying "chcp 1252 > nul". Should fix your issue.