First reaction: Bohemian Rhapsody
The original first of all: Bohemian Rhapsody by Queen, 1975
No singing by me, this post shows reactions of people on hearing this song, sometimes for the first time. How that works i don’t know. There is a kids clip in this selection, they often know this song. I can not imagine how you can live in this world and not know this song.
A little bonus, the Live Aid performance by Queen
The last bonus, Wayne’s World Bohemian Rhapsody: