Thanks for adding this, Sandra that's where I started. Or rather here and using an old memory of the "Black Man etc". I've talked to Rob and several others. Nobody here, so far, has anything more to add about the origins of the words.

Hello Michael. So good to hear from you. So sad that Sandy is no longer able to share this.
Thank you so much for your input.

Rob Willis told me that he was taught the paradiddle while marching as a school cadet here in Australia.
Cheers, Joy