Are you a MOG user in proud possession of a Sonos Multi-Room Music System? Let me make you a happy man or woman: US-based MOG users will have access to the company's on-demand music service through Sonos later this spring , the companies jointly announced this morning. With the addition of MOG, and recently Rdio and Spotify , the list of available music services is beginning to look like a very appealing offer for most anyone (the list also includes Last.fm, Napster, Pandora, Rhapsody, SiriusXM, among others).