A vast range of artists have mined Cat Stevens' songs for mystical and aesthetic source material. His searching vocals resonate in the plaintive cries of 10,000 Maniacs' Natalie Merchant, the sunny bleat of River Matthews and the serpentine croon of Jeff Buckley; his filigreed guitar work is echoed in Stevie Nicks' fingerpicked patterns and Sheryl Crow's muted strum.