Facebook plans to join forces with Spotify, MOG, and Rdio to launch its long-rumored music service later this month, sources tell Mashable. Facebook won’t unveil the project until the Sept. 22 f8 developer conference, but it’s been a poorly kept secret—evidence of it was found hidden in the code for Facebook’s video chat. Unlike Apple, Google, and Amazon, Facebook won’t actually host any music, one source said—it’ll just be a platform for the aforementioned partners.
While Mashable reports it's not clear if other music purveyors will be included at launch, one source noted that Facebook doesn’t like to play favorites, and will likely open the music platform to third parties, much as it does with applications and games. To wit, Reuters adds that Rhapsody and Slacker are also involved. Another rumor: that the platform could one day be expanded to stream video as well. Facebook, however, wouldn’t confirm the report, saying, “There’s nothing new to announce.” (Read more Facebook stories.)