Weekly Watch: 8-Bit Music Theory
Music theory! For video games! If you're new to disassembling music, they do have a (ahem) tutorial level, which I recommend watching. This is the only thing I've ever seen where they bother to explain how you know what note you're counting "third", "fifth", and "seventh" notes from, without which the entire rest of music theory as we know it is complete and utter gibberish.