It probably changes year to year. The music teacher may or may not be there next year. Usually freshman can only do one elective. Make sure to do health ed and the tech credit over the summer.

this stuff is completely up in the air right now. some of the teachers don't even know what electives they're teaching they're teaching next year

Why don't you write directly to the Concert Band Director? They could probably give you the best information.

My middle schooler enjoys being in Instrumental Music, but is deciding on classes for next year at Blair. When is the Concert Band class at Blair? Does it interfere with scheduling at all in terms of completing required electives, doing primary coursework, and still being able to do another interest based elective like art or theatre?