I have been annoyed for some time that there doesn't seem to be any mechanism in society by which people who cannot sing are taught en masse how to sing. We spe

I have been annoyed for some time that there doesn't seem to be any mechanism in society by which people who cannot sing are taught en masse how to sing. We spend so much time in school music classes "singing" with no actual instructions as to how to do it correctly. I genuinely wonder how some people are able to sing properly while others cannot. Those who can sing, where did they learn it at?