I've always loved the nuance, the sort of duality, to Zappa's philosophy on music: he's certainly got strong opinions on what he likes and what he doesn't and that the industry is a bottomless cesspit, but he also believes the bottom line is that people like what they like and that's okay. He writes deep, complex music and lyrics -- but sometimes he writes silly stuff like Dancin' Fool, and he thinks people who overanalyze Jim Morrison's lyrics are missing the forest for the trees.
Ultimately, he's a Serious Musician who has the good damn sense to understand you shouldn't always take music so seriously.