I play the cello (private lessons and school orchestra), sing with the University of Michigan high school choir, and am involved in my youth group in a leadership position. I also participate in some of the drama productions in my school, but am not a committed member of the drama club. I will also begin tutoring kids in the fall. Do I need to add another club to my resume? Or do I need to stick with what I’ve got? Do I need to try for another leadership position in a club in order to show leadership experience?
If you’re happy with what you’ve got, then stick with that; if you really enjoy something else, even if it’s out of the blue, do it. For example, I’m in Science Bowl, Science Olympiad, Linguistics Olympiad, and Chess Club, but I’m also in Music Outreach and a competitive climbing team.
FWIW I think your ECs are great, especially if you’ll study music.