Photo of Zach Galifianakis and Jon Hamm at Bonnaroo 2015, by Jason Merritt

The likes of Jon Hamm, Zach Galifianakis, Chance the Rapper, Bleachers, Reggie Watts, Pretty Lights and more gave Bonnaroo attendees a memorable Throwback SuperJam Dance Party.

Hamm and Galifianakis were surprise guests for the annual SuperJam, which also counted Run-D.M.C.'s Darryl "D.M.C." McDaniels, Metallica bassist Rob Trujillo, SZA, Jamie Lidell and more among its participants.

The '80s-centered SuperJam saw the various musicians and stars offering renditions of "We Are the World," Notorious B.I.G.’s “Juicy,” DJ Jazzy Jeff & The Fresh Prince’s “Summertime,” Marvin Gaye’s “Sexual Healing” Bruce Springsteen’s “Dancing In The Dark” and many others.

Last year's SuperJam featured Skrillex, Janelle Monáe, comedian Craig Robinson, A$AP Ferg, Cage the Elephant's Matt Shultz and more.

See highlights from this year's SuperJam below.