Isn't cantus 'song' in latin?
It should be sufficient to explain that the name of the note "C" is arbitrary. It may be that it came from "cantus", the name of a 2" organ pipe. With his mind set, he will probably ask "Why was a 2" organ pipe called a cantus?" And away you go, chasing your tail.
-- Paul Anderson VE3HOP wackyvorlon@xxxxxxxxx "I'll bet my drunken cat on that!"