[Lonman]

Our bar does not allow in over the mic so I have to abide by that. There are reasons that go back about 12 years ago but not going to really go into it here. I have since edited my books to pull all songs with blatent cursing in them so there are no issues with them - I do not get a big outcry because these songs are not listed. Not a big deal since that system is there 7 nights a week since 92. If someone slips on the mic and says something inappropriate, it usually only takes one warning and they don't do it again, if they proceed to push it further, their mic gets shut off & are escorted off the stage.
Yes it's a bar, but many do not care to hear some drunken idiot scream/sing obscenities over the mic.

Private parties I would actually use the same approach & use my edited books. If someone asked for a particular song (not listed for content) it would be able to be done only if the circumstances & crowd allowed for it.