The clip of 'Unfinished' was shared with fans on Instagram, alongside a series of family photos
'Unfinished' is the previously unheard final song the two brothers ever wrote together
"Your dad took a swing at him! Maybe that’s why he was a little pissed!”
Including tracks by Van Halen and Pharrell Williams
Dave Grohl pretended to rip through the solo before it was revealed that Wolfgang Van Halen had been playing offstage
The group performed Van Halen’s ‘Dance The Night Away’ and ‘Ain’t Talkin’ ‘Bout Love’
“Now that my dad isn’t here to be a target, I guess he went to the next best thing”
He also recounted two instances in which Wolfgang Van Halen tried to "teach him a lesson" by getting the band's accountants kicked out of shows
The two former Van Halen singers have been locked in a war of words for several months
Van Halen told the young Armstrong: "You’re the only one that understands me"