I just found this page and Metchosin's post is very interesting to me. My father (1914-2001) wrote this about his grandfather (1847-1920):
"One of my first recollections of childhood is of hearing my Grandfather Woodin sing mouth-music songs as he bounced me on his knee-crossed foot. The term "mouth-music" may be unfamiliar to some people, but it was an ancient way of singing meaningless words in a rhythmic fashion to accompany dancing when musical instruments were not available. My grandfather's favourite mouth-music song was one beginning with "Keemo-Kymo-Darow-Wye, McKee-McKay-Come-A-Rum-Dum-Tiddle-Diddle". Another began with "Dumpy Overhead with a Tee-Eye-Too", and yet another was "Paw's Little Gel-Gel, Paw's Little Boy". I don't recall many other words, but "Keemo-Kymo" had several verses, ending with "Sing-Song-City, Won't You Ky-Me-Oh?" Another nonsense ending was "Johnny Won't you Fiddle on My Banjo".