I'll go out on a limb and say Freddy King's "Taking Care Of Business" in post #1 has a shuffle beat.
Then his "Out In The Open" in post #3 is not a shuffle - interesting drum accents* - but not a shuffle
I'm hearing a drum decrescendo through [one and two and three] *AND Four
and ... like an unstressed train locomotive on a down slope.
What is that beat called? ...
and this rhythm, from 1959, almost "square"! evenly spaced, clipped staccato: one and two and three and four and
What's it called? Did people dance to this? as in, How the heck did people dance to it
I believe this song goes back to Blind Lemon Jefferson and Arthur Crudup