Suzy Q was a studio project of the Cucuzzella brothers and they used at least three vocalists for this project.
Firstly Carol Jiani did the vocals for the original version of [r=797046], and
on Nov 2nd 2006, Carol Jiani confirmed herself on a discomusic.com forum that she did the vocals of Suzy Q's Get On Up And Do It Again and never got credited.
Then Michelle Mills was the voice of Suzy Q for about a year during 1981, recording the [r=2426494] album, and whose image is used on the picture covers of the a number of 12" releases. This was confirmed by Michelle Mills in a discomusic.com forum on 30th March 2011
Between 1985 and 1987 the vocalist was Angie Vileno.