I was only listening to one of my Sonny & Brownie CDs last night,Doc, I've always associated the whooping with Sonny, and assumed it was his own trademark. No doubt other 'catters might know of an earlier influence but I can't offhand think of one in what I like to think is a fairly comprehensive collection (spouse in background:" Fairly? You've got them all".Me: "So why did you just buy me another half doz. including a Muddy Waters I hadn't got".)
RtS