[TheAnimus]

Zune Pass, no wait it's now called X-Box Music Pass.

Oh heck I don't know what it's called.

The music rental thing, is actually pretty damned good. However like spotify it is missing some artists.

[microtonal]

Except that on the desktop it only works with Windows and not on a Mac.

Their catalog size is 30 million songs IIRC, which is a lot more than Spotify.