Comment by Nextgrid

I'm still surprised YouTube doesn't leverage that feature to build a Shazam competitor. They'd actually have the edge there as they can directly link to the song on YouTube, thus pocketing the part of the ad revenue they keep (the rest goes to the copyright holder).

They could also do that for videos (aka from a screenshot or image it would find you the video for it) as I'm suspecting they have a Content ID system for videos too (I've seen shows recorded from TV being mirrored and the picture slowly moving around, presumably to defeat such a system).