The music industry is full of people who think they can predict what songs will be popular with any given group. It's usually just the cocaine talking, because the truth is, you can never really be sure what's going to resonate with people. We know that to be true, because we absolutely refuse to believe anybody saw these hits coming ...
4Jazz Was Huge in Nazi Germany
Why would anyone be surprised that jazz music caught on in Germany in the late 1930s/early 1940s? Because, much like dancing in the universe Kevin Bacon occupied in the movie Footloose, jazz music was illegal in Nazi Germany, with some enthusiasts even being jailed well into the Cold War years. But, again, just like Kevin Bacon was not going to let John Lithgow keep him from fight dancing in desolate Midwestern barns, so too would the Germans not allow Hitler to keep them from listening to a bunch of opium-smoking beatniks playing the same jazz scale for 45 solid minutes, risking arrest and persecution just to get a little bit of jazz in their lives.