In Primary School we had a Headmistress who was a marvellous singer herself, though none of us appreciated it at the time. She tried to coach us to sing Nymphs and Shepherds, but was doomed to failure with the bunch of rustics that attended that school.
When I moved on to Sir John Deane's GS, we had Andy Horrocks. No singing voice of his own, but a marvellous pianist and organist and a really inspirational teacher.
I don't think he was a folkie, but we did learn Turpin Hero, a bowdlerised version of The Crab Fish, And Benjamin Bowmaneer. He also introduced me to G & S, Bach, and a lot of classical music, and once played a duet of Jesu Joy of Man's Desiring with me, he on piano, me on harmonica!

FC