Cardi B, the Weeknd, Shawn Mendes also performed at 2018 Global Citizens Festival

Pearl Jam frontman also recruited Liz Phair for stripped-back take on "Better Man"

Rapper's 15-date trek was slated to launch September 28th

"Marty and I were young together in a time that defined our lives," guitarist wrote of former bandmate, who died Thursday at age 76

"Whiskey River," "On the Road Again" and "Vote 'Em Out" highlight Nelson's set for the Texas Senate candidate

Willie Nelson headlined a free concert for Texas Senate candidate Beto O’Rourke on Saturday night in […]

West also performed recent hit "I Love It" with Lil Pump