It kind of started with “Mamma Mia”. It is (as is its sequel) is a musical in the classical sense, meaning that suddenly, for no apparent reason, people start expressing themselves through song and dance, but the music was all by Abba. Now, again, you can disagree with me, but I like Abba.
I did not look the lyrics up for this post. So some of the lyrics may be off, and my interpretation is most likely completely out in left field, but I think it will be fun to think about.