Credit goes to Green Day Authority! An unreleased Green Day instrumental from the band’s documentary, ‘¡Cuatro!’ has come to light.

Unofficially, the instrumental is called, ‘This Just Happened’. Listen to ‘This Just Happened’ in the video below.

As Green Day Authority suggests: the instrumental seems to be recorded live in the studio but was never mixed. It was allegedly in a bonus chapter of the documentary.

‘¡Cuatro!’ was released in September 2013.