I know it was a song they already had in the 'bank' as it were, having already started it before they recorded Now and Then, so it was probably useful in terms of them not having to look for extra songs to fill up Side A. But having both 'Sing' and 'Jambalaya' on there was a mistake - they're both a bit twee and the kind of tracks that would turn off critics and more 'serious' music buyers.I watched a recent PBS docu-special of the late Hank Williams (writer: Jambalaya, 1952).
I must say, what Karen and Richard achieved with Jambalaya is truly inspiring (I love their version).
It sorta reminds me of how the duo re-imagined/covered Please Mr. Postman--
of taking a classic and then "pop-ifying" it (yet, retaining elements of its originators).