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In an interview with AllThingsD, recording artist Neil Young revealed that he had discussed high definition music formats with Apple's Steve Jobs prior to his death.



From MacRumors:
The interview is summarized by CNet, in which Young claims that MP3s have just "5 percent of the data present in the original recording." Young is concerned that there is no suitable high definition available to consumers.

Higher definition music, of course, would require much larger files.
  Apple Had 'Worked On' Offering a High-Definition Music Format