Pop music and music in TV commercials getting increasingly sad

A new scientific study reveals that pop music is increasingly sounding more sad. The number of pop hits in minor has doubled since the 60ies. It is generally known that pop music reflects society. Do these new findings thus signify a progressive feeling of depression in our society?

Read on here:
https://www.n-tv.de/wissen/Popmusik-klingt-immer-trauriger-article6428126.html

or here:
120605 SpiegelOnline Popmusik Traurig