You get free $1 Amazon MP3 credit when you buy select kindle books right now, and there is one on sale for free right now. Buy the following book (make sure price is 0 when you check out) Open your hymnal
Wait for 10 minutes and you will receive email saying that you earned credit for MP3 purchase. Go to this page to check your credit balance and to buy music.
Free Amazon ebooks
How to Check Amazon Balance
How to check Amazon digital promotional balance and MP3 promotional gift card credit?
Use this link to check all your Amazon balances in one place (Amazon Gift Card, Amazon MP3, Amazon instant video, Kindle editions, Software/Video Games Downloads balances)