I got a tip to check my kindle keyboard for a special offer, so I did get the music one! Yay! But it's kind of sad that I have used this kindle so infrequently lately that I kind of forgot how it works!
(I'm using my rooted Nook color most of the time, or just my Android phone). Still glad to get the credit, and I'll have to remember to check in with the Kindle periodically!