My personal favorite for flawed reasons is Madoka because I was there for the live reactions to the infamous episode and it was magical watching everyone lose their shit. It was also my re-introduction to anime after being shamed out of it for liking sailor moon as a kid.
I’m having a hard time putting into words. Their songs deviate from the rigidity or rules of music in a way. Whether it be subtly like arranging their songs in a non standard way or mixing the volume in a jarring way or something more intense like playing a single beat of music (a single note) followed by a beat of pure feedback screech.
Honestly just listen to the album and you’ll see what I’m saying I hope