Just like all those "indie game and app bundle" sites, but you source the goodies from your musical userbase. It could be anything, but enough to be of "value" for say 10 bucks, or $25, or $50 or whatever, i.e. 10 mp3s, 2 cds, 1 t-shirt, 25 stickers -- whatever, just start small and built it up in future bundle "events".
Just like all those "indie game and app bundle" sites, but you source the goodies from your musical userbase. It could be anything, but enough to be of "value" for say 10 bucks, or $25, or $50 or whatever, i.e. 10 mp3s, 2 cds, 1 t-shirt, 25 stickers -- whatever, just start small and built it up in future bundle "events".
edit: and of course, you take a cut.