dave coronadodave was the sax player for the soul giants, direct (or semi-direct) precursor to the mothers / the mothers of invention.
jimmy carl black: drums
dave coronado: horn
ray hunt: guitar
ray collins: vocals
after ray hunt had left the soul giants, ray collins brought in frank zappa as a possible replacement. zappa had just gotten out of jail for (alledged) selling pornographic audio tapes. zappa liked what the band was doing and vice versa, so he joined the soul giants. about a month later, coronado left the band as well, leaving the position of leadership wide open. zappa took over and convinced the band to play his compositions, changing their name to captain glasspack and the magic mufflers.
frank zappa (1970): "davy, who was the wise one of the band, knew
the actual truth of the matter, which was if you play original material you
cannot work in a bar. he was afraid of being out of work so he quit the band.
and he was right, we couldn't get a fucking job anyplace."
"dave coronado, however, had a secure job in a bowling alley." -miles, 1993