Just what the box says. I've got hundreds of empty playlists that seem to have been auto-generated for old music that I've since deleted from my Google Music library. No playlists show up online but on my phone the list is so huge I can't make any new ones because it would take forever just to scroll to them. I'm rooted, but to matter what files I alter it seems to either keep the list of playlists or download them from an external server. Someone please tell me they know how how to get rid of these stupid things - I could delete them one-by-one but there's far too many for that; I'd be at it all day.