I mean a feature in a sense that it seems (although I assume I wrong and thus am asking) like something that one uses extremely rarely and offers limited utility. I have used Shazam a few times, and each time quickly install, use it, and remove it. I would have used it more if I could just ask Siri or Ok Google what a song was.

There is another reply to me that snarkily opines that the average HNer doesn't engage in social events, which is a bit humorous really because a more correct statement is that most people are socializing at social events, not doing inference on background music. I can say that I have never, ever seen another person pull out shazam in public.