Yes, it's actually a band, and their music is pure slow and somber j-pop perfection.
I was specifically thinking of the film's music, which heavily features the compositions of Claude Debussy (Any movie that uses "Clair de Lune" as well as this does deserves all the praise in the world.) as well as music from the band Lily Chou-Chou. However, when your vibes and your intended conveying of pure emotion is this on point from practically the first shot? It's hard for me to not want to instinctively call your film "astounding." I want to go back to the sound before I forget. That's probably for now what's keeping me from five stars. Do I sometimes like my movies to be a little more cohesive and easier to follow? Yes. Gorgeous and inventive camerawork and lighting. I was not expecting to be specifically reminded of the style of Hideaki Anno, where although a lot of human drama works so well because of how closely tied he is to humanity itself, the kind of camerawork and ambiance you get from something like Neon Genesis Evangelion felt like the vibe you could only get from a painstakingly designed anime. Instantly one of the most beautiful looking and sounding movies I have ever seen, period. Well, now having finally watched it, I can conclusively say there are very few new film viewings I have had this year that are better than All About Lily Chou-Chou. Adored this, been recommended it before by a handful of good friends, kept pushing it off for reasons that varied from a lack of access to just having other movies that felt more important in the moment to get to. Was going to open this just with a joke sentence like "They're just like me but instead of Lily Chou-Chou, I have Weezer." but then during the end credits, among an onslaught of usernames, I suddenly see a message that comes from a character named "Noah," and I wanted to jump out of my skin.