Google must not be content to sit on the sidelines as Spotify tries to conquer the streaming media world -- the internet behemoth has unveiled a free, ad-supported version of Google Play Music's streaming service for the US. It'll be familiar if you've tried these no-charge listening options before. Besides having to deal with occasional commercial interruptions, you'll lose the direct control that you have with a paid subscription (which, by the way, is dropping the All Access label). You can start a radio-like station based on an artist, album or song, but you won't have on-demand playback, offline support, playlist creation or background listening for YouTube music videos. It's more for ambient tunes than anything else.