Regarding what Frank Zapa's appeal is, to me, probably to some others, too
He had what oin my eyes was the hardest approach to himself and his bandmembers, regarding the craft of musicianship. I guess you could say, the EXACT opposite of punk rock.
George Duke wraps it up well in that video:
That band could play EVERYTHING. And that is, in a nutshell, the goal for any musician, if he/she wants to create new songs, new musical ideas... as long as you are earthbound, because your abilities limit you in certain ways and paths, you are destined to get boring really fast. That is something to be said about the Tolling Stones. They learned fast to get all these excellent sidemen for their albums, because they themselves are doing the same shit all the time. Mind you, in their limizted ways, they are the top of the game. But they still do the same old stuff on their own. Zappa broke the mould every day, and made music that created new paths every record, every show.
That is, what made so many people not enjoy his muusic. The world of rock music and such is one of finding the bestselling niche, and making as many albums using that niche's grooves as possible. Most rock albums in here more or less fit that bill. One or two musicians in the bands - mostly, the lead guitarists, another cliché - add that sparkle to the albums, that make them different, but the other stuff is kind of boring.