Were Pentangle a folk group, a folk-rock group, or something that resists classification? They could hardly be called a rock & roll act; they didn't use electric instruments often, and were built around two virtuoso guitarists, Bert Jansch and John Renbourn, who were already well-established on the folk circuit before the group formed. Yet their hunger for eclectic experimentation fit into the milieu of late-'60s progressive rock and psychedelia well, and much of their audience came from the rock and pop worlds, rather than the folk crowd. With Jacqui McShee on vocals and a rhythm section of Danny Thompson (bass) and Terry Cox (drums), the group mastered a breathtaking repertoire that encompassed traditional ballads, blues, jazz, pop, and reworkings of rock oldies, often blending different genres in the same piece.