There is a famous photo of the great engineer Isembard Kingdom Brunel. He is standing in front of a large boat he has built, with massive chains hanging behind him. His top hat is at a jaunty angle, and he is holding a large cigar. There is a maritime museum in England where there is large reproduction of this picture in pride of place. But the image of the offending cigar has been carefully removed by some skilful computer manipulator.
   Sing the songs, or dont sing the songs. But I don't think rewriting them is an honest option.