I dare not got too deeply into this man's music, but I do have Overnite Sensation and one of the Joes Garage Lp's (pt 1?).
One of my work colleagues was a humungous Zappa fan. The music he played me was so vast in styles and musicianship
I saw the "Grandmothers" live some years ago and it was a superb gig in an intimate venue (The [old] Stables in Wavendon, MK).