Amp'd Up: Amazon has released a limited-access beta version of a new app, Amp, that allows users to DJ their own live radio shows. The free app gives creators access to a library of "tens of millions of songs" – including ones licensed from Universal Music Group, Sony Music Entertainment and Warner Music Group – and the ability to invite live callers to join their programs. “Radio has always been about music and culture,” says Amp VP John Ciancutti. "But imagine if you were inventing the medium for the first time today. You’d combine what people love about radio – spontaneous talk, new music discovery, diverse personalities and broad programming – with all that's made possible by today’s technology." More here.