This is a UI wrapper for Google Music based on Loop and electron-boilerplate It is essentially like running Google Play Music in your Chrome browser, but as a native standalone app with some extra controls, nicer styles, and without having to use Flash.
When you start the app for the first time you will be prompted to sign in through Google's authentication system. This is Google asking for your password information, the app does not save or read any login information. (I recommend that you set up Google's 2-stage verification: https://www.google.com/landing/2step/ but it's not necessary).
Download the zipped .DMG to install on OS X
You can follow these steps if you want to build for OSX, Windows or Linux
npm install
npm run start
npm run release