The twenty-eighth classical recording: #629 Igor Stravinsky - Rite of Spring
First performed as a ballet in 1913, this piece of music caused a riot, in part due to its weird sounds. These days, we're used to the relative aggression, although that was not unheard of, but also the lack of standard keys as normally used. It's slightly disharmonious, and that's a sound we need to learn to listen to. With rock and the like, we perhaps already have, but I understand it was new at the time.
It still sounds mad and maddening at times, a big mess that coheres into an aggressive setup, working especially well to evoke the pagen rites it's trying to evoke. There are a lot of more restful moments in there, in between the aggressive sounds. It evokes emotions in a way where I can really imagine how a ballet would give shape to these.