John Mayer, who is in between Dead and Company tours is currently globetrotting on hit 2019 World Tour. He has a handful of more dates in the US before he heads to Europe for the remainder of the tour.

Last night, Mayer landed at the Chase Center in San Francisco. Deep into the second set, Mayer was joined by Bob Weir for the fan-favorite “Queen of California.” Half-way through the song, Mayer and Weir segued into the Dead classic “Fire on the Mountain.”

Right as the opening lyrics were being sung, a second guest emerged from backstage—Sammy Hagar. The legendary vocalist took one of the verses and joined in on the choruses for the rest of the song.

Thanks to Roman Gokhman for the incredible footage!