Spotify should buy out Discogs. This would allow "playlist geeks" like myself to build proper, complete playlists, with the material that is currently "not available" due to licensing issues, would at least be available in a "blacked out" or "un-hidden" way. This cataloging feature, currently the domain of sites such as Discogs, or genre specific sites like Prog Archives, would gain Spotify an immense asset over its competitors. Imagine if every album and track listing in Spotify also contained the original artwork, the liner notes, release date, personnel, etc... A feature such as this would bring Spotify much closer to being a virtual "record store" or "library". As it is, Spotify is a glorified radio station.