I don't have much experience with it, but no-one else answered yet, so...

I believe square dance calls may be either sung, chanted, or bare-bones spoken directions. There are examples in a Mudcat 1999 Saturday night dance thread.

One term in high school we were taught square dance (which I loved, and the other students hated) with a recording of "Proud Mary" containing sung calls in place of lyrics. Even at an unhurried tempo, it took a lot of practice to follow even these explicit directions. The first verse went like this if I remember aright (downbeats marked here with asterisks; last line just filling time while the long "weave" proceeds):

Well, you *join all your *hands and you *circle,
*All the way *'round the *ring you *go.
*Allemande-left your *corner, come *back and do-si-*do,
Left *allemande, then *weave around the *ring you *go.
Rollin', rollin', rollin' on the river.