Hey ho, time for frivolity (whilst forum administrators frown!)
I don't know if anyone has noticed, but a rapid search around Amazon this morning shows a considerable number of CDs marked with the warning "explicit lyrics".
Now I've always thought this phrase indicates something a fellow might be rather cautious about in showing to his aged aunt.
And since the phrase appears on CDs of at least Cesar Franck, Grieg, Tellefesen, Hans Huber, Kuhlau and many others I rather wonder if, after all these years, I've missed out on something possibly important?
In my limited English I read a similar caveat only on the cover of an Emi Cd containing a Thomas Adés anthology (a Cd I own). The main work was "America: a prophecy". Honestly I don't remember if that caveat was justified or not. I kept the Cd far from aged aunts hands.