I have reached the stage where I am ready to integrate music into my game and started shopping for royalty free music and discovered Luckstock,com, you have to use royalty free music or else you will have to pay money to the author for every single purchase of the game.
I was a little lost about what licence I needed as I was a game developer and not musician or lawyer. They were extremely helpful and even offered me a discount. I explained to them that there would be many Cocos2D developers out there that would be in a similar situation and so they kindly extended my discount to all Cocos2D developers. Here are the details (I get a referral out of it too :-):
Go here: LuckStock.com - Royalty Free Stock Music & Audio Marketplace
and apply the coupon: NaderEloshaiker
It will get you a discount of 10%. Apparently the coupon expires on August 2013