So, Christmas carols — they haven’t really gone away, but we don’t sing them as much as we used to. We aren’t, in general, much good at massed singing these days. Look around you at a church wedding when it’s time for a hymn and watch the congregation standing in mute embarrassment, the only sound coming from the organ and the choir (if there is one). That’s partly because hymns nowadays are known only to churchgoers, and they are in a minority; but it’s also inhibition.
Singing is like swimming — a natural, healthy and intensely pleasurable physical activity — but you have to try it, preferably when very young, to make this discovery. If, as an adult, you enjoy singing, you probably came to it as a child. Until the 1950s, you might well have sung round the piano with your family, but then the passive consumption of television put an end to that form of self-entertainment in the home.