There's no knob to turn on a pipe organ.
Some people are lazy, myself included most of the time. However, many more people are simply unused to singing.
People used to sing in the home, while they worked, in their carriages and automobiles, in the classroom, at Sunday school, at family and community gatherings. Most fraternal and charitable organization meetings opened and closed with a song. In the United States, the collapse of school music which delivered a "common repertoire" means that we lack shared songs.
Individuals also hold themselves to a much higher standard because of the broadcast and recording industry. Sure, they sang high notes. (And maybe I should tell you what my songbird of a Southern Baptist grandmother (may she rest with the saints) sounded like on those high notes.) Fear has silenced those unpracticed voices.
If we want people to sing in church, they need to sing other places as well.
And while I'm at it - when was the last time you heard anyone whistling a tune? When I was growing up, men of all classes whistled quite well - opera, Big Band, folk songs, the Old Rugged Cross, you name it. Now it's a rareity.
I would think it incredibly rude for a vocalist to come and demand that something be set in their key especially at the last minute. But I find demanding behavior to be rude in any situation. I'm much more about respectful requests.
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