Completely negotiable at this point. I understand we're primarily indie here and are not made of money. When I make music, it's licensed under me. What typically happens is the client buys the rights to use my music for his game at a flat rate. (say $3-$10 depending on run-time. Usually $3 per minute). He or she gets to use whenever wherever just by signing a document I e-mail or fax to them (and they send back signed). However, other people can buy this same track and use it by this system.
That's pretty typical.
From this I can also bundle the songs together and release it as an album for listeners. For custom music that I give you complete rights to (i.e. no one else can use it. Not even me.) will be charged at a higher flat rate naturally and a document saying I agree.
But we can always discuss something else entirely. Once I was paid in small portions at a time. That's fine. But once I wasn't paid in about a month and so I just didn't finish working on a song until the last payment was met. It's a two-way street. I do my part and you do yours. :)
