Part of the research I do online, with Google Chrome, requires me to go to several sites including those who, for some dumb reason, think it's alright to hide the music player.
If I want to listen to music I can play my own and I usually am listening to something else when a random site starts playing random looped songs.
So, how can I find out which tab is playing music, and eventually mute it?
MuteTab Beta solved the problem for me.
Although this is not the best solution, since this is a beta version, the fixes available in this version will eventually get in the stable version so MuteTab will work again.
In Chrome there's a small button icon to the right of your extensions. Click it and you'll see listed all the tabs that are currently playing audio followed by those that can but aren't. 
MuteTab is an extension for Chrome that detects which tab is playing music and allows you to mute them.
I normally have numerous windows and tabs open and looking for a tab by the sound icon is a time consuming case of 'where is waldo'.
It's not a perfect solution but using the built in 'Task Manager' and sorting by 'Idle wakeups' column helps me find the culprit much quicker.
Use this Chrome extension:
Go to Playing Tab
With this extension, you jump directly to the tabs that are currently playing sound.
I use Volume Booster, which has the added benefit of boosting audio if needed.
Music playing tabs appear in the popup window of the extension, focus on click, and there you can pause or mute the player or tab if the player lacks controls.
Switch to audible tab is a browser extension just for that with a few unique features like jumping to a notification or setting certain domains as "always audible". It works fine even if there are multiple tabs with sound or notifications, unlike some competitors.
https://chrome.google.com/webstore/detail/switch-to-audible-tab/obhmhiijebijngjodncffkecfiolonom
