Only good for those of us on google music who prefer everything on random.
Download all of your playlists to your library. Then cast while playing in google music on android or in chrome browser with a windows 7/8 pc.
Can anyone test this, I'm lacking the ability to test it with over 65k tracks currently.
You can still play individual playlists then. But to load hundreds of playlists its far faster to just put the library on random.