You can experience a strong antidote to this modern slop by going to your next Barbershop Harmony Society concert (the old S. P. E. B. S. Q. S. A., Inc.), or Sweet Adelines show.
These well-trained amateurs personally propagate the excellence of singing by performing both old-time and newly-written harmonies, not by merely listening. And there is just such a chapter of singers not very far from any wannabe singer in the USA. Support them by your attendance at their shows. They will sing for you on request.
Excellent idea! Thank you!