Spirasyzx, you say that most people take lots of AP classes in senior year. I don’t know your school, but that’s not true most places. My high school is one of the top schools in my state and is known for being extremely competitive and having a serious academic focus. Sends plenty of graduates to top universities every year. Believe me, plenty of those kids are not knocking themselves out taking AP for the sake of AP. They take AP courses that interest them. They also play sports, are in one of the bands, orchestra or choral groups, are active in theatre, and pursue all sorts of interests. There’s so much more to life than piling on AP classes.
You WANT to do band. You think you’re supposed to take another AP. Do what you WANT.
And from an academic perspective, especially since you say you found Chem 1 difficult, you’ll probably do yourself a favor down the line if you don’t take AP Chem now and place out of the equivalent course in college, College courses often cover material not covered in a high school AP class, and if you place out of it you’ll miss material you’ll probably need if you’re following a science path. Take Honors Chem, give yourself the opportunity to really grasp the material, and then take whatever chem you need in college.