There need to be more inspirational marching band movies. They have great potential for the inspirational sports movie plot. Just think:
A small town DCI group with a major losing streak gets a young, new, band director fresh out of college. He teaches the band to take pride in themselves and their music. Together with a bunch of his friends from college, he helps the band create a new identity for themselves and they go and melt faces with their music.
Only, before going to championships, tragedy strikes. Somebody, dies, or quits, or there’s some sort of betrayal. The band has to overcome it and become stronger as they learn how to perform with the same passion that they have when they’re happy as when they’re sad.
Another subplot could be that the band director or drum major is having trouble working up the confidence to propose to his longtime girlfriend. As the band goes on a journey of self discovery, so do they. At the very end, after winning the championship, they finally work of the courage to propose.