Pandora has 1.5 million paying subscribers ($36 a year). That's not a bad # considering their free service is also available on mobile devices.
The on-demand music side like Spotify doesn't allow free music on mobile devices (in hope to tempt listeners to switch).
Muve Music should be at around 1 million right about now since the number above isn't up to date. It is poised to overtake Rhapsody and Spotify in USA paid subscribers in the very near future. Because every Android phones you buy with Cricket (a regional prepaid carrier with 6 million customers) will come with Muve Music bundle along with your smartphone service ($50 a month for unlimited music download + unlimited talk/text and 1GB of data).
Not sure why Sirius XM is on the list because they only pay 8% of their revenue as music royalties. They are a subscription service but music is only a part of their overall subscription.
eMusic is another interesting player and has been stagnate (maybe even decline) ever since the streaming took off.
p.s. Just waiting for the IFPI to announce 2012 subscription # worldwide. Even a modest 35% increase would bring it to over 18 million subscribers worldwide.
2010: 8.2 million paying subscribers
2011: 13.4 million paying subscribers (growth of 63%)
2012: ?----------(18 million if the growth rate slow down to 35%)
Just the biggest 2 (Spotify and Deezer) right now combined for 8 million paying subscribers.