"Sire" is a song written by Lady Gaga in 2012. Gaga sang it backstage of ArtRAVE: The ARTPOP Ball Tour on May 18, 2014 to fans. Gaga also sang it the previous year, in February 2013, to select fans who went backstage with her.
Gaga said it was inspired by Michael Jackson. She sang the song for some little monsters backstage.
A snippet of the song leaked on January 10th 2015, it's very edited but you can hear some lyrics
She got my heart,
She got my brain
I, I, I
(Link to the leak: https://www.youtube.com/watch?v=aUXcoz99NcQ)