Stock20.com offers 1 (one) royalty-free song - that's a $ 7 gift certificate - when you create your account. And if you mention me as a referral, I get a free song too. Here goes nothing:

Stock20.com creates high quality music for media production. If you create a free account using my referral link, they will give you a $7 store credit (which will get you one free song).

Here's how:
Click this link, then create a free account (it takes about a minute):

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You will get a gift certificate by e-mail for $7 of in-store credit.

Note: You can be assured that Stock20.com will not give away your info. They send out one e-mail per month when they release their new songs.