Indeed, Ralph Page used to chant along with the music in quite a melodious way.
Not sure if you'd call them "singing contras" since he wasn't always
following
th exact tune, but he did call some dances as one would a singing square, with
plenty of rhyming couplets and with the calls coming at the same time as the
action.
Here's an example he provided of how he'd call Lady Walpole's Reel.
http://tinyurl.com/27zv8zm
David Millstone