This is what it’s like to be a composer: I am always thinking about the piece I am currently working on, the pieces I will write after this one, the piece I am supposed to write next year. When you and I are having a conversation, part of my brain is engaged in imagining music. For me, there are no clear boundaries between composing and everything else I do; I am thinking about it all the time. I don’t just get up, go to my studio, and start composing. I have already been thinking about it since before I woke up, and I will continue to think about it while teaching and conversing and even listening to other music. But most of the time, the task of figuring out meter, tempo, pitch, register, dynamic, timbre, instrumentation, etc. — how to …