This seems relevant here, too:

Subject: RE: Posting Explicit Lyrics
From: Max
Date: 22-Jun-00 - 04:38 PM

WARNING: Life may contain things that are offensive.

Life may contain sexual situations, racism, hate, bad language, rude behavior, fascism, censorship, tragedy, and politics. If you are offended by anything in life, we recommend a unique and personal defense. One shall not be provided for you by any religion, government, organization or other entity external to you or your immediate family. Because that would be wrong.

Folk is Life with a better melody. The warning is inherent.