OK, MMario, I get the distinction - click here for the version MMario is talking about.
I was reading last week that "Shortnin' Bread" was racially offensive. I never thought of it that way - it was just a cute kids' song to me, that I learned 50 years ago as, "Two little children, lyin' in bed, one of them sick and the other 'most dead..." Well, I found out this week that the original version was "Two little darkies, lyin' in bed..." There two songs are examples of where changes in lyrics are perfectly appropriate. They're good, fun songs. They probably weren't intended to be racist in the first place, but changes in our culture have made them that way and a few little changes can fix 'em so they aren't offensive. Same with a number of Stephen Foster songs.
Now, if I could only figure out what to do with Edward Lear's "Owl and the Pussycat." It's a great poem, but nowadays a guy can't get up in front of a bunch of kids and say,

Oh Pussy, oh Pussy, oh Pussy, my love,
What a wonderful pussy you are.

-Joe offer-