A few months ago I got a program called LMMS (idk what that stands for), a program where you can create custom music! I forgot how I found out about this, but just recently I started paying some attention to it. It's AWESOME! They have a bunch of digital instruments that you can use (like a piano, guitar, etc), then you can put them together to make something really cool! I've heard other people make music with it, and it sounds amazing! Here's some music that someone else made. I decided to have some fun with LMMS (be aware that I know barely anything about how to use this program), so I made this "Mario video game style" short music:
You can download LMMS for free here: https://lmms.io/download/#windows