I rewatched it in order to write this article, and yep, The Disappearance of Haruhi Suzumiya is just fantastic.

There's probably already a generation out there that doesn't know Haruhi Suzumiya, so let me introduce it afresh.
The original is by Nagaru Tanigawa. Produced by Kyoto Animation, the first season was made in 2006, and in 2009 a total of 28 episodes aired, combining 14 rerun episodes and 14 new ones. Among them, the "Endless Eight" storyline broadcast the same story across 8 episodes with subtle variations, which stirred up all kinds of buzz (or rather, complaints). It's a story where the characters get caught in a time loop at the end of summer break, and viewers watching in real time split into two camps: those wondering when on earth they'd escape the loop, and those who delighted in comparing the director's subtle differences in each episode.

By the time it aired in 2006, the ED theme "Hare Hare Yukai" already had a wonderfully well-made dance, and people started increasingly imitating Haruhi singing "God knows..." in a bunny-girl outfit at the school festival, or uploading videos to Nico Nico and the like. It was already a talking point during its real-time broadcast.

Let me explain the story simply. Upon becoming a high schooler, the protagonist Kyon meets a beautiful girl named Haruhi Suzumiya. Haruhi declares, "I have no interest in ordinary humans. If there are any aliens, time travelers, or espers here, come see me!" Eventually realizing that nothing will change if she just sits and waits, Haruhi drags Kyon along and creates an unofficial school club, the "SOS Brigade" (the Spreading excitement all Over the world with Haruhi Suzumiya Brigade). And those gathered there are people who, for various reasons, can't reveal their true identities: the alien Yuki Nagato, the time traveler Mikuru Asahina, and the esper Itsuki Koizumi. And no wonder, because Haruhi Suzumiya was a girl harboring the power to rewrite the very common sense of the world, even unconsciously to herself.

Now, amid all this, the long-awaited theatrical film "The Disappearance of Haruhi Suzumiya" was screened in 2010. As the title suggests, just before Christmas, Kyon wakes up to find himself in a world where Haruhi Suzumiya is gone, Yuki Nagato has become an ordinary, timid literary girl, he has no connection to Mikuru Asahina, and as for Itsuki Koizumi, his entire Class 9 has vanished. Of course, there's no such thing as the SOS Brigade either... that's the story.

My recommendation in the score is Track 14, "READY?" Kyon, bewildered in a world without Haruhi Suzumiya, succeeds at the only clue he has, the task of "Collect the keys," the PC begins to boot up, and he's told to decide which is better: this world without Haruhi or the world he originally came from.
Strictly speaking it plays just before that scene, but where the air had been heavy until then, this becomes a bright track where hope is found and the world transforms.

https://www.youtube.com/watch?v=QD3bjMvAuOo



Another piece from the score I want to introduce is Gymnopédie No. 1. This is included on DISK 2, while No. 2 is the one used in the film itself.
It's a famous piece of classical music used in CMs and theatrical trailers, the kind where you think, "When you say The Disappearance of Haruhi Suzumiya, this is it."

https://www.youtube.com/watch?v=QbMye8-chLM



Now, finally, let's part ways after watching the theatrical trailer.
Keep on supporting John Smith, who'll keep spreading excitement all over the world!

https://www.youtube.com/watch?v=eHKyNQopYXo
The Disappearance of Haruhi Suzumiya visual

Quoted from the official site https://www.haruhi.tv/fanclub/index.html