Thanks! It was tough for me because I'm not a professional musician, but I did remember how to read music a little bit from when I was in high school choir. It's helpful that there are interactive transcriptions of classical music out there, such as on flat.io.
I guess my best advice is just to give it a try! I was dreading the prospect of sequencing music for my game, but it became easier as I worked on it more. Best wishes for your games and music!