Lady Gaga opens the iTunes Festival with an hour-long performance of music from her upcoming album ARTPOP. Surrounded by her Little Monsters in London's celebrated Roundhouse, Lady Gaga performs seven new songs, including her hit single "Applause."

Cast:Lady Gaga, Too $hort, Twista, Amanda Balen, David Lei Brandt, Graham Breitenstein,

Genre:Music,

country:United Kingdom,

Production:Apple, Interscope Records,