I'm a young developer with a penchant for music and quality software. I have spent the last 16 months developing an open-source Google Chrome extension which attempts to simplify the experience of using YouTube to play music.
Streamus: http://streamus.com/
Streamus currently has 14,000 users and is the #1 trending / #4 ranked 'fun' extension in the web store. I've built it entirely from scratch while teaching myself the basics of BackboneJS (and Backbone.Marionette), RequireJS, GruntJS and many other, smaller libraries. It has been a great learning experience.
I would love to field any questions about the product, challenges encountered while creating it, etc. Really anything you'd like to know -- I'm all ears and super excited to discuss it.
Here's all the source code if that's your thing:
https://github.com/MeoMix/StreamusChromeExtension
https://github.com/MeoMix/StreamusWebsite
https://github.com/MeoMix/StreamusServer