"Sire" is a song written by Lady Gaga in 2012 for ARTPOP. During a Q&A that took place on June 22, 2015, DJ White Shadow answered a fan's question that he produced the song, and that it had a BPM of 103.
Lady Gaga sang it for her fans backstage in February 2013, and again during ArtRAVE: The ARTPOP Ball backstage on May 18, 2014, July 11, 2014 and August 31st, 2014. Gaga mentioned that it was inspired by Michael Jackson. A snippet of rehearsal for this song was recorded and reported to be from The Dive Bar Tour although some speculate that this is not from The Dive Bar Tour at all.
In the same post, a high quality instrumental snippet of Sire was uploaded and nobody has heard of the song since then.
WARNING! These lyrics are what fans remembered from the ArtRAVE: The ARTPOP Ball, and from the snippet. They are in no specific order.
"I'm not your Billie Jean"
"I could be your thriller
Billie Jean is still pregnant.
I'm not worthy of you, liar.
I'm not worthy of you, sire."
"You never know
I could be Michael
The next Michael Jackson"
"You're the king and I'm not worthy." 
"So don't leave me yet."