simon-weber/Unofficial-Google-Music-API — pull request #46 by Tyris (2012-09-04 03:31:46+00:00)
Title: Uppercase extensions (.MP3)

I've got a bunch of files in my library with full uppercase names or just uppercase extensions. Currently gmusicapi thinks it can't upload (or even convert) them.
Added a simple .lower() on the extension to resolve this.