I want to know the answer to the following question:
What kind of music is sold by these companies?
All the background I'm provided with is that "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.". Is that enough to answer the question?
Answer: yes