Brett Morgen’s Kurt Cobain documentary, “Montage of Heck,” features a slew of exclusive music, video footage and diary entries that give a deeper glimpse into the life of the late musician. All of the previously unreleased songs featured in the doc, which Morgen discovered when sifting through hours and hours of tapes, will finally be released on the official film soundtrack on Nov. 6. But you won’t have to wait that long to hear them.

“E-Coli,” a nearly-nine minute demo from the film that was never officially released, has now leaked online. The song initially made its way online via Reddit. If that’s not enough to hold you over until the full soundtrack is out, 14 other previously unheard Nirvana mixes and demos have also recently leaked.

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