That's a good idea. But perhaps the same thing could be done with qrcode or NFC, which could be printed on a ticket, or linked from an eticket, and the content could be downloaded straight to your phone over wifi before you leave.

Ticketmaster and iTunes (e.g.) will already have your payment details too.

Wouldn't a quality live recording need some post production though? I would have thought it would at least need to be mixed by a pro.