Over the last few weeks, we've heard of a feature popping up for Google Play Music All Access users here and there (thanks for the tips!), whereby the app or web interface would link users to relevant music videos inside the app. When listening to or browsing music, the app would show a YouTube icon, sometimes in the center of the screen, sometimes weirdly positioned in the "now playing" bar. It was clear Google was still testing the feature but it looks like now, with the publication of an official change log for Play Music's latest update, Google may be flipping the switch on a wider basis.
Google Play Music Starts Providing Shortcuts To Relevant YouTube Videos was written by the awesome team at Android Police.