A while ago I bragged about my own music player. Basically I couldn't find the player I liked so started creating my own. It was the first time I wrote anything related to media or a GUI -good thing my basic requirement was simplicity- and was interesting to do, but I never found the code amazing.
A little later, after using my own app with pride and also implementing a few features incredibly inefficient, I discovered Decibel Audio Player. The code is way more advanced then mine and it's a lot better. It has most of the things I did want in my player eventually already and yet is still very simple. Definitely recommended, I'm not going to bother anymore improving my own creation.
PS: did I mention that, just like mine was, Decibel is also written in Python?