Stringsinger "4. Highly developed composed music through the ages including Musica Antiqua"

So how about the fragment of Mozart that evolved into Michael Turner's Waltz, somewhat extending its presence by so doing?

Other tunes? Tunes people can whistle, even. The RAF March past - the number of people who could whistle that. And, literally, the other side of the 78. The Dam Busters March. Written by Eric Coates before his commission for the film. Orchestral. Used as mouth music by football crowds and by bright young things in drinking games.

Colonel Bogey? Composed by Kenneth Alford [Lieutenant F. J. Ricketts] in 1914. Very much in the oral tradition as a tune. As for the various words....

As for the couple of internal sales ladies who used to hum or la the theme from The Great Escape on Friday afternoons.

'Folk' in this context is merely a semantic label, anyway.