I have a great deal of respect for the video game music composers of the 1980s. Using technology that looks extremely primitive and limiting now, the greats like Koji Kondo and Nobuo Uematsu were able to create amazingly catchy songs to accent the games that we played.
Using the sound card limitations of the NES (Nintendo Entertainment System), I've composed some songs myself, and they're now for sale on the Unity Asset Store! Click on the image below to check them out!
Examples of the songs included are below: