I just realized something.
So, Reinhardt has this spawn room interaction where he tells Lucio that he should listen to the classics, like Hasselhoff. I assumed that Hasselhoff was some German composer from Beethoven's era, but then it dawned on me that Reinhardt was born in 2015. So, I googled Hasselhoff and he's actually not that old, he was big in the 80's.
That means that for Reinhardt, 80s music is "classical" like Bach or Mozart is "classical" to us. That means that to him, classical music is stuff like this:
https://www.youtube.com/watch?v=dm7jEA3frY4
and this:
https://www.youtube.com/watch?v=PJQVlVHsFF8
and, most important of all… Never Gonna Give You Up.
IN THE FUTURE RICKROLLING IS CONSIDERED CLASSICAL MUSIC