Kurt Cobain: Montage Of Heck already had its premiere on HBO a few months back, but the documentary was so popular that it’s getting a theatrical release next week (8/7) in some of the top media markets. To entice people to go who have already seen the film (or who can just stay home and watch it on HBOGO), director Brett Morgen has added a new, previously unheard demo to the film’s soundtrack.

Billboard says that the song is untitled, as are all the tracks pulled from Cobain’s audiotapes, and was recorded sometimes around 1991. They report, after hearing the song, that Cobain sings in a falsetto for much of it and some of the lyrics include “Wonder how I breathe” and “I’m a bad man.”

Morgen says that he won’t disclose where exactly the song pops up in the film to dissuade people from taking recordings of it, but does say that he placed the track into the film without changing the cut as it appeared on HBO.

Kurt Cobain: Montage Of Heck has been nominated for seven Emmys. It’ll be in select theaters starting 8/7. An album of home recordings from Cobain is set to be released sometime this summer.

Read our review of the film.