The rough solo version of "Sappy" recorded by Nirvana's frontman will be included on the companion album to HBO's documentary "Kurt Cobain: Montage of Heck", reported Aceshowbiz.
The soundtrack, "Kurt Cobain - Montage of Heck: The Home Recordings", will be released on November 13 and will also include Cobain's cover of The Beatles' "And I Love Her".
The soundtrack will be available digitally as well.