Lady Gaga gave the Internet a look inside the rehearsal for her Sept. 1 iTunes Festival performance, during which she is practicing a new track, likely to be called "Swine" (the clip flashes the words #swinefest, so it's safe to assume).

It starts off with a ballad that sounds like a mix of Lana Del Ray and Nirvana and quickly progresses into screams of rage as she drums vigorously over synthesizers.

She sings ""I know, I know, I know, I know you want me / You're just a pig inside a human body / Squeal, squeal, squeal you're so disgusting / You're just a pig inside, swine."

This single is quite a departure from her first ARTPOP single, "Applause," a pop-y dance track. The new song seems to come from a darker place, though the song might take a happier turn later in the track (fans will have to wait until Sunday to hear more than just a one-minute clip).

iTunes Festival will be streamed live from London with 30 nights of free live music starting Sept. 1. Gaga's set starts at 4 p.m. EST. Other acts taking part in the festival are The Lumineers, Kings of Leon, Vampire Weekend, Avicii, Elton John, Kendrick Lamar, John Legend, Ellie Goulding, Justin Timberlake, Arctic Monkeys and more.

The full album, "ARTPOP," is scheduled to drop Nov. 11. She might even more material from the album during her iTunes set.

What do you think of the new song?

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