Toronto's own deadmau5 opened up the iTunes Festival in London. The DJ-producer performed together with Friend Within + Kate Simco and the London Electronic Orchestra to kick off 30 days of concerts. Deadmaus5 is the first Canadian act to open this prestigious event. His electrifiying performance is available for viewing trough iTunes on Macs, iOS devices as well as Apple TV. Check out this year's impressive list of artists here. Visit: www.itunes.com/festival and join the conversation: @itunesfestival using #itunesfestival.