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While digital sales have yet to compensate for this decline, they nevertheless represent a significantly increasing proportion of the revenue of the major music recording companies.MP3 players, such as Apple’s iconic iPod and corresponding online music storefront iTunes, have driven the switch from physical to digital. With mobile handsets already being a widely-owned device, and having evolved to a point where they support the downloading and mass storage of MP3s and other audio files, they represent a significant opportunity for digital music services – particularly because they remain alargely untapped market.