Meet "Worse than Banshee"
The New Mutants had a garage band.
Sam on drums (Keeping them all together as best he can)
Dani on lead guitar (taught herself as a kid)
Doug on keyboards (A keyboard is a keyboard to him, and music is a language of expression)
Berto on bass (His parents made him take guitar lesson, he can also play classical and flamenco, but would rather not)
Amara on vocals (She's trying to get Rahne to join in so she can harmonise)
Rahne on tambourine (too self conscious to sing and no musical training)
Illyana has no interest in music, but heckles for fun
Xuan chooses not to take part, but tries to field complaints from Xavier/Magneto and the older X-Men about keeping the noise down.
It is vitally important to this concept that they are not good!
They are loud, they are dedicated, but they are awful.
Berto and Dani are the only ones who can play an instrument properly (and Doug, though they think he is cheating since his powers help), the others are... "keen" is perhaps the most accurate word.
The band name came from a comment overheard by Kitty, when Logan said "Those kids with their noise are worse than Banshee" and, well, they liked it so much, they kept it as their name.
There is one recording of their playing a session, deep in the Xavier archives. When Doug came back he found the long forgotten file and broadcast the performance one night in the Danger Room for the now older team. A LOT of beer was drunk that raucous night!