Sturgill Simpson, Bob Weir and John Mayer all on one stage? Say less. Country music star with countless genre-bending hits?

Sturgill Simpson delighted fans at Dead & Company's show, which was held in honor of Grateful Dead's 60th anniversary.

Sturgill Simpson joined Dead & Company for a powerful "Morning Dew" on night two of three in San Francisco's Golden Gate Park ...

Grateful Dead offshoot Dead & Company and Sturgill Simpson combine for memorable moment at Golden Gate Park in San Francisco.

Trey Anastasio of Phish, Billy Strings and Sturgill Simpson were among the special guests to join the band over three nights ...

Photo courtesy of Dead & Company via Dead & Company's Facebook page Dead & Company's three-day run at San Francisco's Golden ...

Surviving Grateful Dead members returned to their hometown to celebrate the band's 60th anniversary across three big shows in Golden Gate Park.

Dead & Company brought in Sturgill Simpson and Grahame Lesh to help put together a stellar Saturday showing in Golden Gate Park.

Simpson performed the song in front of Bob Weir, Mickey Hart, and Bill Kreutzmann, the Dead’s three surviving members.

Simpson performed the song in front of Bob Weir, Mickey Hart, and Bill Kreutzmann, the Dead’s three surviving members.

Footage of Jerry Garcia singing the song appeared at the beginning, and the three surviving members of the Grateful Dead — Bob Weir, Mickey Hart, and Bill Kreutzmann — were in the audience.