Dave Mason’s career was less a straight line than a map of late-1960s rock at full pressure: Traffic, Hendrix, the Stones, Harrison, Clapton, Delaney & Bonnie, Fleetwood Mac. He was often in the room when the room mattered.

Mason, the English guitarist, singer, and songwriter who co-founded Traffic and wrote the rock standard “Feelin’ Alright?,” died on Sunday. He was 79. A cause of death was not immediately available.

“On behalf of his family, it is with deep and profound sadness that we share the news of the passing of Dave Mason,” his publicist Melissa Dragich said in a statement. “Dave Mason lived a remarkable life devoted to the music and people he loved.”