There are circulating reports that the official instrumental "Aura" / "Burqa" is not the same version leaked yesterday. It is said that the hacker who leaked the song would have had access only to the voices joined Gaga and instrumental parts unknown.
The producers of the song, the Irish duo Infected Mushroom (with DJ Zeed and Gaga), had played a snippet of instruments in a presentation in early 2012 in New York City.
SEE IT YOURSELF: (youtu.be/...)
It is unclear whether the introduction and other excerpts we hear in the demo version will be completed or re-edited. At the moment all links on the Internet with the song they are trying to be removed by Interscope Records.