THIS! Instrument-playing capability of a social environment: By today, I know only of one person playing a piano regularly in his club, he is the only one I know. When I was young, you had some basic instrument introduction in music classes at school - I do not know if these still exist today.

Regarding singing - I do not know a single perso who can "somehow" sing at least a little bit.

The society is loosing these capacities.