Selling Music Meant for Game Mods?

[MetalRenard]

I haven't had any problems with this. I'm very open from the start about what is for sale and what isn't:
As the developer you:
- Can use all music and sound effects within the scope of your game and advertising of the game in videos.
- Can modify the length and bit rate of the audio to suit your needs but nothing else.
- Cannot resell the music or make it available for download outside of the game itself.
- Must only provide audio previews using the links I provide.
- Must credit me in full at any mention or use of my work (e.g. Music and audio by MetalRenard; http://metalrenardmusic.com )

Now for me, this is the bit that changes. I either grant exclusive, timed exclusive or non-exclusive contracts. The price varies greatly.
- Exclusive: The music will never be used for any other project. You essentially own all reproduction rights outside of my personal use and use in my portfolio. Most expensive.
- Timed exclusive: Your exclusive rights expire after an agreed date (usually 2 years after release of the game).
- Non exclusive: I will write the song with your request in mind but I retain all rights and ownership of the music. I can resell the music for other projects as I see fit. (of course with this I am careful, I usually wait a while before reselling anyway).