Just spent about 15 minutes trying to track down the source of some music on my PC. No browser tabs. Turns out Steam has a music player? And my cat I guess started something playing? And the music player can be hidden with no indication in Steam that it's a thing and it's playing sound?
Also it was from the Devil Daggers OST, which is creepy but also I like it but also I didn't recognize it at all, so I was getting a little spooked. Also I may have had an edible