MIKE MCCREADY

That sentiment is something that Skip Marley, a third-generation musician and grandson of reggae icon Bob Marley, has grown up knowing as well. “Music is music. The event will raise money for the Playing for Change Foundation, the United Nations Population Fund, Sankofa, Silkroad and the Rock & Roll Hall of Fame Foundation. It’s a spiritual experience to sing his grandfather’s songs, Marley said. “Those are the songs I first hear and the songs I first sing,” said Marley.

Pearl Jam fans who answered FaceTime calls from the rhythm guitarist got something extra for taking a vote-by-mail pledge — the latest offering from the band in a career full of activism and advocacy for political causes. Gossard offered free tickets to the next Pearl Jam show in that person’s city. “They were really happy when I told them I’d get them into the show,” the 54-year-old Gossard with a laugh. McCready and Gossard said Philadelphia has long been the home of Pearl Jam’s most fervent supporters. Gossard says his campaign promise of a few free tickets will be kept — as long their fans take the pledge.