If you are going to post a modification of a song, take responsibility for claiming the modification and let people know where to find the original. This is true of traditional and copyrighted material -- I hate it when someone hears something I have written in someone's modification and has the temerity to say that it is better than the original without ever hearing the original song sung.

There are wonderful songs out there that we cannot sing now because they offend people. Stephen Foster's "Uncle Ned" has one of the most beautiful melodies I have ever heard. I learned it in childhood before political correctness hit the fan but I bet few people hear it now. I'm not saying it is a lyrical masterpiece, but, oh, the tune.