On Sept. 26, the Sinclair in Cambridge hosts the Legendary Pink Dots, the Amsterdam-based experimental rock group. Formed in London in 1980 by songwriter/vocalist Edward Ka-Spel and keyboardist Phil Knight (two constants through three decades of shifting personnel), the Dots’ extraordinary prolificacy (36 albums so far, not including live recordings and compilations), indefatigable touring, and restlessly speculative psychedelic style have made them influential cult paragons.
Their music ranges far beyond psychedelic stylings, but the Dots keep faith with the psychedelic-rock penchant for invented mythologies — boasting a gritty, wryly apocalyptic, and unusually intricate example — and maintain a commitment to the genre’s ideal of performance as ritual, a communion between onstage celebrants and an audience of votaries. “Music is a ritualistic experience,” Ka-Spel has said. “A Legendary Pink Dots show is an amber mass.”