Wednesday, May 4, 2011 11:47am ET by  
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Lady Gaga debuts new song during concert

Lady Gaga used her performance in Mexico's Guadalajara last night, May 3, to premiere a brand new and previously unheard track from her forthcoming album, 'Born This Way'. 

The international pop sensation tweeted to her fans before the show last night, teasing that she had something exciting in store:

"Can hear 30,000 Monsters slamming the stadium floor in Guadalajara. It sounds pop revolution, fists pounding furiously. Have a big surprise."

During her set, she simply announced to her audience of Little Monsters, "this is called 'Americano'", before launching into an acoustic version of the track. Gaga originally explained this song as being "a big mariachi techno-house record, where I am singing about immigration law and gay marriage and all sorts of things that have to do with disenfranchised communities in America", but it seems to work just as well with this arrangement. 

Check it out below: