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In the past Digital Audio Players (DAP) mostly now usually called called MP3 players were tied to manufacturers desire to capture their customers by making use of proprietary audio formats. This meant the Digital Media player audio format used was determined by producer. If you already had other Digital Media Player audio formats they'd being converted. Often this may lead to further problems converting in one Digital Media Player format to a new. While I've browsed Google, Yahoo, Bing and Wikipedia, I can not find an answer about why. I've examined those sites of Taylor, Martin, Gibson, Fender and even more manufacturers and they also definitely don't discuss it. I can not even find anybody with a guitar online forum that has speculated about why.