(maybe slightly brainrotted bc of how much i'm projecting my own music taste onto them & how far they are from canon kitty section. they will not be rock artists in these hcs i'm sorry i just don't like rock. but you can't say i didn't warn you about the brainrot!)
(also some things i mention are technically canon, not headcanons, but i thought i'd mention them anyway just because)
their music is like a a lovechild between melanie martinez and sofia isella— deceptively childish, saccharine, nursery-rhyme-esque, creepy, and high-pitched like melanie martinez, and with the most artistic, gorgeous, rhythmically & texturally beautiful, haunting lyrics i've ever heard, like sofia isella
think of it like… lacey games, or any of that hello kitty analogue horror but in song form. it starts off fine, then gradually gets creepier, and by the end it's barely recognisable as the same genre, but there isn't a pinpointable moment the tone switched
also, related to the lacey games thing: almost all their songs are on one lacey games fan playlist or another. the vibe just fits super well
also ofc the background music is kickass because luka, juleka and ivan (and adrien! i love fics where he pulls a mdc and joins as a secret member) need to shine as well!
as just mentioned, adrien occasionally performs with them (with a mask on, and only his first name on credits. idk if that would work legally but y'know what this is a world of magic jewellery and tiny gods fuelled by cookies, i can bend french law)
(i don't care about anything beyond season 3 btw. myléne is not the tambourist either, season 6 is just… no.)
ivan also plays orchestral percussion as well as drumkit bc you can make some really sick sound effects with them and i think they could utilise that super well
specifically thinking about the lovely bass sound a timpani gives— it's still a pitched instrument, unlike the bass drum on a drumkit, so it can be matched nicely to harmonise or be discordant with the other parts, which would be a wicked way to make a song subtly sound more wrong as it plays. would also work with bass guitar or other bass instruments, but percussion def sounds different from strings, and i'm pretty sure it's a lot louder too, so they can have a really loud bass note without having to electronically boost the guitar. also i just think timpanis are cool
or, in slightly more layman's terms: the timpani is a set of really low drums, and they all at different pitches, unlike the big drum in the centre of a drum kit, so you have more variety. this variety can be used to start off the song playing at pitches that match well with the rest of the instruments, then end off playing at pitches that do not match well with the rest of the instruments, making the song sound off. because the timpani goes super low, it's often quite difficult to tell the difference between the individual pitches. therefore, playing it at a pitch that doesn't match the rest of the song will not be very obvious, but the listener will (unless they're completely tone deaf) still subconsciously be able to tell that something is a bit off, making it a good tool to subtly change the song's tone. this will also work with other instruments, such as the bass guitar (which they already have), but the timpani is a lot louder and has a different texture from the bass guitar, so it would still be useful. also (as stated above) i just think timpanis are cool
i also think a glockenspiel (metal xylophone, sounds like bells) could sound both sweet like a nursey rhyme and creepy like gothic church bells or something (idfk i'm not christian) and that would be sick
rose can do a really cool thing with her voice where she can make herself sound like a broken record— like with the little breaks in her voice, repeating the same sound over and over. it sounds mechanical as hell and not like someone actually singing like that. it's one of her trademark techniques, and they use it in almost every song
they avoid using backing tracks when possible. they just think it's cooler to have everything played on live instruments— it allows them to take more creative liberty with the tempo, and generally be more flexible. they don't never use backing tracks, just a lot less than most other contemporary bands.
marinette is an honorary member bc she's their designer!
marinette, nath, and alix also all make an album cover or something at some point. idk i just like art club solidarity
idk what marc could do… i feel like song lyrics are a little bit out of his wheelhouse. maybe he's just moral support or smth
alya would definitely promote their stuff on the ladyblog
their first song is still "i love unicorns!" and it starts super sweet (rose is not a heavy metal singer here i'm sorry) and nursey-rhyme-y and then it gradually morphs into a minor key and discordant notes and creepy sound effects and becomes like… the singer is begging unicorns to not gore her with their horns kinda deal
honestly that may not be a very good song concept, but whatever. i'm trying my best ok
their other songs don't have the same names as in canon though, except for maybe adrien's love song
max set up their website, with alya's help, and marinette and nath are in charge of the visual aspects of it
myléne runs said website though, she just didn't code it. if she wants something adjusted, she asks max or alya for help, but she's the one who figures out what needs to be changed and how to get more engagement and what fans want from the website, etc
alix is in charge of stage design for their performances
kagami plays violin, and sometimes she pops in with some nice violin solos; you'd be surprised how well violin can blend into contemporary music— once again, look at sofia isella!
marinette also designs merch
uh yeah that's all i can think of!