I'm having trouble finding a reference, but there's an audio snooping application technology that will recognize what media you're watching or listening to and

I'm having trouble finding a reference, but there's an audio snooping application technology that will recognize what media you're watching or listening to and phone home with the details. Such an app could live in your phone (listening wherever you go) [how many apps demand microphone access, and why?], your Echo, etc.