This all kind of reminds me of the whole PMRC debacle back in the mid-80s where a number of Senator's wives decided that all music should be censored. Frank Zappa was one of the most vocal opponents of the scheme, and testified in front of Congress about it. The PMRC idea failed, but record companies assumed some self-censorship that we still see in the form of the Parental Advisory stickers.

The thing that this specifically reminds me of is that one of the first albums stickered in such a way was FZ's Jazz From Hell -- which is entirely instrumental.

BTW, if you haven't read it, you should totally check out FZ's speech. It should be required reading ... somewhere.