A teenage rock band have become the first group to play a series of live gigs using only Apple iPads and iPhones for instruments.The groups - from Kazan, Russia - do not use a single traditional instrument in their set of covers of hits by rockers like Nirvana.Instead they download apps for drums, keyboards and guitars and play them onstage through a downloaded mixing desk.Ruslan Halikov - app guitarist with Cooperative Style - explained: "It's actually harder to play the guitar on an iPhone than it is to play a real one."But then it is a lot harder to pull cool rock and roll poses, though, but the audiences seem to like what we do."Source: orange.com