Beginner-friendly music apps make creating a simple song as accessible as playing a game.

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Both marketplaces essentially treat buying an app as if you are buying something much simpler like a song or a simple app for the iPhone or Android.

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Take "Vaca, " a simple Argentine children's song about a cow.

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Frankly, "Case" sounds on the verge of imploding as it is, with an acoustic-guitar solo that might be called flamenco if it weren't so scattershot and an otherwise-simple quarter-note pulse, which creates the illusion that the song's center is constantly shifting.

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The idea behind the fork Song brought to the Consumer Electronics Show in Las Vegas is simple, even if the technology is not.

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Music can be collected into a jogging playlist and a simple Tapping Control Jogging mode makes it easy to change to the next song without interrupting a workout.

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Linktone's premise is simple enough: Users send the company a text message, ordering anything from the song "Tong Hua" ("Fairy Tale") to the daily installment of a romance novel.

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