Coincedentally, the first class on my list is the class I'm making this for. I've enjoyed it, and learning Web Design, albeit a basic form, will be quite a useful skill, especially when used in tandem with JavaScript that I'm learning in AP Computer Science Principles, and as I polish my skills.
Precalculus is my third most interesting class behind both of my Computer Science classes. I've always liked math, and we're talking about sine waves this year. While it doesn't directly connect to music, I think it's pretty cool.
AP Computer Science is interesting because I'm learning things that I haven't learned in other computer science classes, like what bits are, and how the internet works.