School bands are seen as uncool
How can we change that?
The music they play (marches, musicals, classical, symphonies ++) are part of the problem.
Creating new music for an entire band requires much work, even rewriting existing well known music is hard.
Create projects where the goal is to play a single pop-song, rap song or similar, heavily inspired by the existing music score.
Take only a few, very talented musicians, able to improvise and have simple score-writing abilities. The instruments should resemble the sound made by the original score. IE drums, Bass brass for base, wind for synth and so on. Using a singer from a choir can also be possible. Simplicity is key.
Each musician/instrument should at first try to mimic the sound their music score makes, before they try improvising. Rehearsal can be done solo at first, playing alongside the original score.
The projects main goal is recreating the original score, but preferably also changing it to their own interpretation. Band members should preferably be changed for each new project, and multiple projects can be run simultaneously.
Note that such projects are expected to be labour intensive, and require much following up.