Kurt Cobain fans have another reason to look forward to film director Brett Morgen’s forthcoming music documentary about the troubled and talented musician. Kurt Cobain: Montage of Heck is set to feature a previously unheard Cobain solo track, according to a recent tweet sent by Morgen.

“Listening to a mind-blowing 12-minute acoustic Cobain unheard track that will be heard on the Montage of Heck soundtrack,” Morgen wrote, on 7 March. Amid excitable responses to his tweet, Morgen made no mention of the soundtrack’s release date nor of the song’s title.

An accompanying book, published by Insight Editions, is due out on 5 May. It is set to contain photographs, animation stills and documentation of other pieces of archival material from Cobain’s life.

Montage of Heck was premiered at Sundance film festival in January, is due to hit UK cinemas on 10 April and is to open in Los Angeles theatres on 24 April, according to Morgen. TV audiences in the US will be able to watch the film when it premieres on HBO on 4 May.