The show, themed "A Cat's Attic" and performed on a stage dressed to recall the early '60s bedsit over his parents' London café, traced his development from Steven Georgiou, the Beatles- and Bernstein-loving teenager who wrote British Invasion hits for others, to Cat Stevens, the singer-songwriter and seeker who from the late '60s into the mid-'70s produced a string of global smashes that remain staples of the boomer canon, to Yusuf Islam, the Muslim convert who stepped away from music for nearly three decades to focus on family and philanthropy.