Such a small change, but it will make a huge difference for me. I listen to a lot of music and have a ton of tabs open at all times. When I tire of a song and just want to close out the window, I have to do one of two things. Either I remember which tab is playing music (not going to happen!) or I click on each one till I find the correct tab. Instead Chrome, now has a little icon showing which tab is playing audio.
This should be mandatory for all browsers.