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(This isn't a spoiler)
There is a sequence in Joker where Arthur Fleck descends a long flight of stairs. He's in full Joker mode and dances to music that only he hears.
I would argue that it is one of the most iconic moments in cinema in the last ten years. CNN didn't like the choice of music. Well CNN, tough shit. It's fantastic and damn near perfect.
The song is "Rock & Roll Part 2." Here is the fan-made music video.