I applaud students who enrich their lives with both, athletics and the arts. Being involved in the arts is looked at in a lot of schools as "unpopular". It does however, diversify an athletes profile, and is equally important to the growth of our youth. With the information given by the OP, the decision is simple to me. Go to the band competition. The player is asking to be excused from 1 practice, and has already proven her resolve. How would the coach feel if she asked to miss a play off game to attend band practice? Unfortunately the kids are proving again they are more mature than many adults. IMO coaches, or others who don't understand the importance of our youth living diverse lives are ignorant and arrogant.