Lady Gaga has previewed her upcoming iTunes Festival gig with rehearsal footage of a new song.

The superstar singer is due to play London's Roundhouse on September 1 as iTunes hosts a month of free concerts.

She has been busy rehearsing the set, which is due to feature a multitude of tracks from her forthcoming album 'ARTPOP'.

Gaga, who has dubbed her show 'SwineFest', has now uploaded footage of herself rehearsing a new song, which is reportedly called 'Swine'.

Lyrics included: "I know you want me. You're just a pig in a human's body."

The track features a heavy riff section that sees Gaga playing a simple disco-esque beat on a stripped down drum kit.

Gaga's 'ARTPOP' meanwhile is due to be released on November 11.