Song will appear on the rock band's forthcoming double LP, Return of the Dream Canteen
The guitar aces only meeting was documented as Van Halen dropped by to film a promotional video for ALS awareness
“Looking up to him as a young kid was one of the driving forces in my needing to pick up a guitar,” Mayer writes
Hear our selection of the guitar legend's best songs
The musician lived for his music and six-string
“My father … lost his long and arduous battle with cancer this morning,” Wolfgang Van Halen wrote. “My heart is broken and I don’t think I’ll ever fully recover from this loss”
"We certainly have enough material. It is a matter of timing and getting everybody together," guitarist says of band's next album
Band postpones Japan tour while guitarist recovers
Van Halen's new memoir, Brothers, due Oct. 22, will tell the story behind one of the closest family partnerships in rock