Just posted at JingleSamplers.com: Ken Deutsch’s article “Ron Hicklin and the Voices Behind the Hits” (which originally appeared in Goldmine).
If you had your TM or JAM jingles sung in Los Angeles, chances are Ron Hicklin was the leader of the group.
Direct link here: http://jinglesamplers.com/ronhicklin.htm
Also on the page is the TM Productions Ron Hicklin Singers demo.