Google Music to Add Upload Feature

To upload audio files to Google Play Music, you need to use Music Manager. It's only available as a native app for Windows, Mac OS X and Linux, so you can't use it if you have a Chromebook or a mobile device.

What if you need to upload a few songs and you don't want to wait until Music Manager syncs your files? What if you're using someone else's computer and you can't install Music Manager?

Google Play Music's source code includes a message which suggests that you'll be able to upload songs from your browser: "Drag songs or folders here to add music to your library. Or, if you prefer, select from your computer."

Update (March 2014): the feature is now available in Chrome.

{ Thanks, Florian K. }