Sanne Schaap is a person. I don't know much about them, but they obviously know some computer programming, and enjoy simplicity. Schaap has a website called Sheep Friends, where you can download some of the applications he's made. The main one I love is the music player, Billy. It's described as a lightweight, no nonsense audio player that allows you to quickly play an entire directory of mp3 files. And that's exactly what it does.
Billy is tiny - about half a MB, or there's the run-only version (no setup), which is even smaller. It loads all your mp3s in next to no time. If you want to find something, just start typing. There are keyboard shortcuts for everything. And it's super minimal.
It's been my preferred player for the last five or so years, and I'm always harping on about how much better it is than iTunes. Billy can't burn or write CDs - it does mp3s, and it does them very well.