Alex Van Halen has shared a snippet of Unfinished, the last song he ever recorded with his brother, the late, legendary Edward Van Halen. You can hear it in the Instagram post below.

The full recording will be included in the audiobook of Alex’s memoir Brothers, scheduled for publication on October 22 via HarperCollins.

Alex Van Halen promises that Brothers will “set the record straight on Edward’s life and death.”