I can't download past purchased DLC.
I have purchased song before and can't find them on the store for download.
edited June 2017
Those are all Rock Band DLCs, right?
1. It seems most of them are RBN Songs. You're playing RB4, right? Well, RBN Songs aren't available for RB4, as of yet.
2. You posted in the Dance Central thread, and I don't see anything from Dance Central in your list. Unless your missing songs are Dance Central DLC, which would make sense.
Go on your Xbox and download them from there.
My bad, i was trying to post on the rock band, but my phone was messing up.