generate questions: Unauthorized MP3 file sharing continues on next-generation peer-to-peer networks. Some authorized services, such as Beatport, Bleep, Juno Records, eMusic, Zune Marketplace, Walmart.com, Rhapsody, the recording industry approved re-incarnation of Napster, and Amazon.com sell unrestricted music in the MP3 format.
What kind of MP3 file sharing continues on? {sep_token} Beatport, Bleep and Juno records are examples of what kind of service? {sep_token} What kind of music is sold by these companies? {sep_token} Which format is used by the companies that sell the music legally?