The more we learn about Lady Gaga's ARTPOP the less we know about what to expect.  While she's given us some of her classic dance pop with first single "Applause," a rehearsal video the singer uploaded on Thursday (August 29) shows that it won't be all flashing lights and thumping beats. 

The one-minute clip is a teaser for Gaga's headline appearance on Monday at London's Roundhouse as part of the month-long iTunes Festival.  She teased fans about it on Wednesday with a provocative picture of herself standing next to a dancer who's wearing a metal pig gas mask along with the message, "REHEARSAL PIC #SWINEFEST #GETREADYTOSQUEAL." 

What she revealed on Thursday was a snippet of an ARTPOP track reportedly called "Swine," which has a driving, industrial rock groove that's reminiscent of Nine Inch Nails.  The teaser opens with Gaga seated at a keyboard singing, "I know, I know, I know you want me/You're just a pig inside a human body," as her band patiently waits their turn to chime in. " Squeal-a, squeal-a, squeal-a you're so disgusting!" 

Though the subtle groove continues, the scene changes to Gaga — wearing black tights, a long white T-shirt and a black wig — bashing away at cymbals on a stripped-down drum kit, her hair flying, while playing keyboards with her left hand. 

Eventually the band kicks in with a classic rock-like heavy guitar groove that explodes into a galloping industrial sprint, with Gaga continuing to bash away at a cymbal with a yellow drum stick and yelling, "Swine!" 

Gaga has promised to play a number of new songs at the iTunes fest and when MTV News caught up with legendary Bay Area rapper Too $hort on Monday, he revealed that he's recorded a song for ARTPOP and that he was slated to perform it live with Gaga soon.  At press time it was unknown if that as-yet-untitled track would be on the set list for Sunday's gig.