I believe that Peter was influenced by American sacred music in a way that positively broadened the listening habits of many in British folk clubs in the seventies.Many discovered a whole new repertoire that was relevant to our folk tradition and some of us wondered, for the first time at its rawness and vigour-Sacred Harp singing for which we must give great credit to Peter for broadening its exposure in UK.I remember when he came back from USA,totally blasted by the Americana as sung by Lisa Null and Bill Shute and he was just fizzing with it.They are greatly worth a listen.