Sometimes we get WAY too serious about some of our musical details. Some people get bent out of shape because someone doesn't think an auditioned choir is the highest form of choral work. Others think we should never use sheet music. I on the other hand, believe there is room for it all.
We need to be true to the music. Good tone production, rhythm and harmony are paramount. Whatever our format, teaching and supporting people who want to learn and grow are SO important.
Not taking ourselves too seriously really makes it work. There are any number of ways to get to the same goal that of really well done music that people enjoy producing.
However, that being said, wait until you hear how this comedic bit has a really tough half tone. Tim Minchin is a really great musician. There is nothing harder than singing what seems like a "wrong" note. Although it is in fun, it is really good musically. What do you think?