If They Could Transform - Partridge

Never watched this show, even once.  I suppose because by the time I was a little kid, it was already into re-runs.
It was only on tv from 70-74 I believe, so most of you younger folks probably don't even know what this show is!
(and to be honest, I don't really know either, I just know it was about a musically talented family who had a bus.)