Some of those kids listening have no idea that the sounds they are hearing may never be topped in their lifetime....360 deg surround sound, sheer power and volume, amazing harmonies.
I’m dying happy after hearing this through headphones. Would give my step off foot for a chance to have been in the center of that circle absorbing full volume.
I think I figured out one reason they sound so amazing: in this video, once they hit the big chords really loud, you can hear a ton of overtones that they aren't playing that almost sound like a flute or impossibly high trumpet. They're playing so in tune and so efficiently that they effectively flesh out the orchestration without actually having those sounds, and it makes it way more engaging and immersive
It's also not just about the music. You can feel the music in your chest cavity and thanks to the tubas, the ground you're sitting on vibrates. It's incredible, get inside a horn circle if you ever get the chance.