Chrome now lets you mute a tab and all its annoying sounds.

My biggest pet peeve online is when a background tab suddenly starts playing some kind of video ad (with sound) or even worse, starts playing lousy music.

Your only choice was to mute your whole computer. No longer!  If you’re using the version 46 or greater of Chrome, just right-click on the tab and you can mute it. Yippie!

Now instead of hunting for the mute button on autoplaying videos or looking for the audio player on the website of that restaurant who feels the need for mood music, you can just right-click on the guilty tab, select mute, and kill sound on the entire page.

Source: Chrome now lets you mute individual tabs | The Verge