I want to contribute and this is one way I can do that. It also gives me some practise with recording and all that as well. I have the rhythm track done now, did it last night. Gonna finish it up some time this week. I didn't just grab any old chord progression and throw it together. I picked a progression that is fairly basic, like you say it's not so much about the backing track, but also gives the soloist some direction and inspiration to play along with. I also agree that there needs to be a consistent release and someone to keep reminding people about it etc.