The Black Roots of Rock -- 75 Years Ago?
Since my teen years (the 1960's) I've read countless histories of rock music. They usually recognize the black music of the early-to-mid 1950's ("Rhythm & Blues" or "R&B") as the principal ancestor of rock'n'roll, but they rarely discuss anything earlier than the 1950's. Of course, they know that rock has also included elements from Tin Pan Alley pop music, from country and hillbilly music, from traditional blues, and from jazz -- all of which are much older. But I'm now referring only to their discussion of the characteristically black singing styles that progressed from slow ballads (e.g. The Five Satins "In the Still of the Night") to fast and exciting rave-ups (e.g. The Isley Brothers "Shout"), thereby leading up to rock'n'roll.
Actually, I believe the earliest roots of rock go back a little further than that. Here's an example of a hit from 1942 that would only have been called "pop music" at the time, but which impresses me as a possible ancestor of R&B, and therefore of rock as well.
[video=youtube;ikyh1CAfHW0]https://www.youtube.com/watch?v=ikyh1CAfHW0[/video]