So just go back to the Store and click Buy, rather than do it from the demo.
I don't know if what I'm saying isn't getting through I'm trying to make myself clear. There is no option to buy on the the rockshop for me all it says is DEMO there's no option to buy the song nor is there a quick and easy way to find it when it shows a song, for example what I just used Paralyzer, all it says is DEMO there is no option to buy nor is there just a regular version of the song that doesn't have DEMO on the side of it I've tried scowering through the DLC menu for the xbox but again there's no fast way of doing it. It's not like you can just type in the name of the song or the artist and it'll send you to it. for me Rockshop must not be working correctly.