MC Music Player is a LiteLoader mod, which allows you to play music from in-game. It's still in planning and VERY early development. Nothing is promised to actually come out of this project. You are free to look around the code and maybe pop in with a pull request/issue if you have anything you want to tell me.
Here's a preview. Looks pretty snazzy so far, ey. ;)
Link to album showed in the image: In Real Life