context: 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.
question: సంగీతాన్ని చట్టబద్ధంగా విక్రయించే కంపెనీలు ఏ ఫార్మాట్ను ఉపయోగిస్తాయి?
answers: MP3