Why would you be depressed by 70’s/80’s music ?? And it depends really on when the vids were taken. Of course it is going to be a different level of awareness with communications today than the ‘70’s.
It seems there were a lot of sad and depressing songs in the mid-1970's--like "Wildfire," "Seasons in the Sun," and "Emma." These seemed appropriate for the era of Cold War defeats, stagflation and malaise that preceded the Reagan presidency and Morning in America.