I have a Spotify tab and a YouTube video open at the same time and the media key always used to hit whichever app macOS decided to remember, not the one actually making noise. SmartPause fixed that immediately, it just pauses whatever is actually playing audio right now. Menu bar only, no extra window, no account, exactly what a utility like this should be.
SmartPause
Thanks Gal,
I take note of your opinion, I will definitely bring this feature with an update in the future.