Millenials don't like email. Text is proven to get seen and produces much higher results in engagement and action.
It's not easy coordinating many moving parts in a dynamic organization like a marching band. Let's look at the different constituencies:
That's a lot of different groups to communicate with. And it's not only communicating. It's also capturing information and responding with relevance. You've got to get the new recruits into your system. Then there's events, promoting open days, and faciliating auditions. That's a lot to track and too much to keep up to be personable for each individual.