The Kurt Cobain documentary “Montage of Heck” will be in theatres April 24th and on HBO May 4th. This unreleased Beatles cover by Cobain has never been heard by the band. It is one of many songs that have never been released that will be in the documentary directed by Brett Morgen. Morgen was given full access to Cobain’s personal and family archives. Along with its score of unreleased music, Montage of Heck will feature rare footage from numerous Nirvana performance plus Cobain’s home movies, artwork, photography, journals, demos and songbooks.