This is all a bit bizarre. If you need to be told the songs then you don't get the joke. 'Fry me a kipper, cos i fried a kipper over you' - if you don't see that's Cry me a river then you're either younger than fifteen years old, not a native english speaker, don't have a television or are not very observant.
The sheet music line was great deadpan - much funnier than the original piece. I don't want to say anymore but it's difficult for me to believe that anyone was really offended by this.
If so then you're in a different plaice to me.