Procol Harum was one of the first bands to bring a classical music influence to rock 'n' roll, incorporating classical motifs into classic rock hits as early as 1967. They were also among the first to feature a non-performing lyricist, the poetic Keith Reid, as a member. The band's dual keyboard setup, complemented by future solo star Robin Trower's blistering lead guitar, was ahead of its time as well, and the band's personality remained intact even after Trower and organist Matthew Fisher left the group.