Unreleased Green Day Instrumental Surfaces

Green Day Authority has posted up an unreleased Green Day instrumental from the band’s documentary.

This little surprise was hidden away in a bonus chapter on ¡Cuatro!, the band’s 2013 “rockumentary” movie that chronicled the recording process of the ¡Uno!, ¡Dos!, ¡Tré! trilogy albums. The song is unofficially titled “That Just Happened” after the scene that contained it.