About the joke…

Hello Muddah, Hello Fadduh (A Letter from Camp)

“Hello Muddah, Hello Fadduh! (A Letter from Camp)” is a [1963] novelty song recorded by Allan Sherman. The melody is taken from the ballet Dance of the Hours from the opera La Gioconda by Amilcare Ponchielli, while the lyrics were written by Sherman and Lou Busch. Allan based the lyrics on letters of complaint which he received from his son Robert who was attending Camp Champlain, a summer camp in Westport, New York.

Hello Muddah, Hello Fadduh! (A Letter from Camp) - YouTube