My kid didn’t have a lot of ECs…but the ones she had were ones where she grew into leadership positions. So…for wind ensemble, for example, she wanted to show that she was librarian and secretary. And was in the ensemble for four years. I believe she fit most of that in the one line for that activity.
For precollege orchestra, she wanted it noted that she was section leader. Again…it all fit.
Just listing “wind ensemble-9-12” would not have shown her leadership positions.