EIGHT months ago a mysterious image showed up on YouTube, the video-sharing site that now shows more than 100 million videos a day. A sinewy figure in a swimming-pool-blue T-shirt, his eyes obscured by a beige baseball cap, was playing electric guitar. Sun poured through the window behind him; he played in a yellow haze. The video was called simply “guitar.” A black-and-white title card gave the performer’s name as funtwo.

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