I’m a huge fan of the $20 Capo app on the iPhone, which lets you easily learn songs from your iTunes library by slowing them down, changing the pitch, and more. But Capo didn’t originate on iOS—it's been a Mac app since 2009. And with SuperMegaUltraGroovy’s Monday release of Capo 3 for OS X, I figured I should finally give the Mac version a spin....
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