Lady Gaga at iTunes Festival in a shell bikini and seaweed thong (view pics)

The concert started with her swinging over the audience in a cage and involved many on-stage costume changes, elaborate wigs and dancers in hazard suits wearing pig masks, hanging from the ceiling.

The songs included "Jewels & Drugs" a rap number featuring T.I.pop song "Sex Dreams" and ballad "I Wanna Be With You."