I am late, but have finally started to subscribe to Spotify, and have been listening around for the last few weeks.
Lots of good stuff there and a fantastic place to be for the end user.
Not for the sound freaks I guess, lots of artists missing in there and artists are still far from happy with the money they get from the streaming of their material.
I´m diving into the stream anyway and am testing playlists today.
Let´s see if this playlist is working then, a list of Robert Wyatt covers for your pleasure (I hope!).