Perhaps you like the idea of an iPod Nike or even the "Code M" musical shoe. There's just one problem: Both require physical exertion. There may be a compromise in this idea for a sound shoe, which envisions a built-in CD player and speakers, as well as a volume knob and other controls on the side, according to Slippery Brick. Given that it's only a concept, we're curious why an MP3 player wasn't included--and a beer tap, for that matter.
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