Lady Gaga opened the 2013 iTunes Music Festival live from London's Roundhouse with an hour of new music from her upcoming album ARTPOP. Mother Monster's set list included new tracks "Aura," "Jewels and Drugs (feat. T.I Twista and Too $hort)," "ARTPOP," "Sex Dreams," "MANiCURE," "I Wanna Be With You," "Swine" and her brand new single "Applause". Watch the show below and let us know what do you think!