Twenty years ago, 16-year-old guitar novices would have killed for this app when they were teaching themselves Nirvana and Pearl Jam songs in garages -- by ear. Today's kids can just use Capo 3, a thrilling app for Mac and iOS that automatically tabs out any song thrown at it, making it a slick must-buy for amateur and professionals alike. A single programmer, working as SuperMegaUltraGroovy, is responsible for the original, award-winning Capo, which debuted for Mac and iOS in 2009. On Oct.

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