What everyone would play in marching band, plus various headcanons, in no particular order. It is my duty to deliver as a band kid.
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Luke: Alto saxophone - They play "Careless Whisper" every chance they get.
Parker: Tenor saxophone - They brought extra water and sunscreen at band camp because they knew that the rest of these disasters would forget. (Somewhat based on a true story where my friend was bright pink at the end of day 1 bc he forgot sunscreen and had to borrow mine.)
Lee: Quints - I always saw them as a drum set player, and quints are the closest thing in marching band. They can 100% play the Jig 2 solo flawlessly.
Trayden: Baritone - They are SO BAD at marching in time. Most of the time they just walk and hope the band director doesn't notice.
Moav: Bass drum - They're serious about it. There is no way you can get them to put their drum down even if they get scoliosis from holding it.
Max: Trumpet - Apart from "Awesomely scored by a chorus of trumpets," their ego is too big to not be a trumpet. They are unnecessarily loud with it too.
Stuart: Flute - They play it in the music video, plus flutes are known for their suppressed rage. They enjoy playing trills and also blasting the others' eardrums out with a high note.
Ryan: Tuba - They never miss a chance to remind everyone that "technically, a tuba is the concert band version, the marching ones are called sousaphones"
Nathan: Cymbals - They like having something they can sing - or rather, shout - along with. They've dropped and subsequently broken at least two sets.
Simon: Clarinet - They always ask "why can't we have marching oboes?" and get shot down every time.
Mason: Trombone - Once a bunch of trombones in my band stacked themselves up into a pyramid on their hands and knees and that just seems like something Mason would do.
Seb: Trumpet - Pretentious fucker. Their trumpet is silver and they're the section leader even though they have no idea what they're doing half the time.
Malcolm: Tuba - Listen. The horns and tubas share a bus in my band, and it is actual hell having to listen to them blast "Cbat" and "Rattlin' Bog" from their tiny ass bluetooth speaker at 10 pm while we all just want to get home. Malcolm is the one controlling the soundtrack, and they refuse to change it.
Byron: Snare drum - Their years of bartending have made them a pro at spinning their sticks.
Victor: Trombone - They had the guts to jump out of a 4-story window. They have the guts to do Trombone S*icides (look it up it's really cool).
Patrick: Alto saxophone - They've memorized "Carameldansen" and "Megalovania" so that they can play them every game.
Matt: Clarinet - They blame every wrong note on their reed. They play a bassoon in concert band.
BONUS! Kai: Mellophone - I might be biased, but we're the fruitiest section by far. They love playing random little songs and seeing if anyone knows them