Frank Zappa testified before a highly publicized congressional committee hearing on the subject of rock lyrics, inspired by the PMRC (Parents Music Resource Center), which included Tipper Gore, wife of Senator Albert Gore (D-TN) who was a member of the committee. This paper (1) summarized the issue and (2) analyzed Zappa's testimony.
The presentation's title is borrowed directly a short FZ tune on the album, We're Only in it For the Money which featured a cover designed to parody The Beatles' Sgt. Pepper's Lonely Hearts Club Band album cover:
What's the Ugliest Part of Your Body?
What's the Ugliest Part of Your Body?
Some say your nose.
Some say your toes.
But I think its your mind.
The album also included "The Chrome Plated Megaphone of Destiny" inspired by Franz Kafka's "The Metamorposis." The theme of control by authority also appears in Joe's Garage with The Central Scutinizer, whose job it is to enforce laws that haven't been written yet.