I think you'll find Zappa is a woefully underappreciated artist. He did a lot of..unusual stuff earlier in his career, which is why many people wrote him off, but his albums in the late 60s & 70s were extremely good composition-wise and his recording quality was excellent. Apostrophe was a very commercial album..it actually made it on the charts, but far from the really good stuff.
Try out
One Size Fits All
Bongo Fury
Hot Rats
Joe's Garage Acts I, II, III
Zoot Allures
Chunga's Revenge
I saw him five times. He died at age 52, prostrate cancer. He was very angry about his life getting cut short as he had so much work planned that he couldn't get to.
A friend saw his son in a concert years ago.."Zappa Plays Zappa" I think it was..said it was like hearing Frank on stage again.

