I saw this clip earlier and thought that it illustrated a good point about teamwork. One of the things we have to constantly remember in choir is to never be too loud. A choir, after all, is not about just one person but about the whole group. Practice and unity causes us to blend the right way, producing the right sound in order for us to sing a song the right way.
Just like music, sometimes, life's "notes" get a little out of tune. Teamwork, however, is what makes a simple melody a beautiful song.