Not unless you want to or someone does it for your own benefit. Especially if you play an instrument where getting a baseline level of competence in reading and

Not unless you want to or someone does it for your own benefit. Especially if you play an instrument where getting a baseline level of competence in reading and playing written music is all you need to be able to do to be part of the ensemble, and especially when it's a relatively casual ensemble like most high school bands. Not just theory though. I've met people who continue to perform in orchestras decades after high school and college, who play with really good groups, and who have literally no interest whatsoever in the music they play, let alone its theory. It's always bizarre to me to talk excitedly to someone about the piece their orchestra is playing to only be met with confused indifference about it and the composer. For some people it's just an activity to keep busy and nothing more. This is not necessarily a bad thing, it's nice that there are many ways to engage with music and be able to choose how involved you want to be.