In Scotland we might have one of the most outstanding examples of a teacher who practically
instigated a revival all on his own in the West. The later MP Norman Buchan inspired many in his house gatherings ( early 60's ?) too and, of course, produced his essential Scots song book.
As for me, The Ash Grove and Bobby Shaftoe (maybe Marie's Wedding) was the diet. But really, music in secondary school took off after the seventies. There is a school in Glasgow which has a great Irish music "club", I believe.