There literally is an app for everything these days.

And in the case of Spotify, there's an app for the app. Forgotify, which launched earlier this year, trudges through the millions of tracks on Spotify in search of the millions no one has yet to play.

As of last fall, 20% of the songs on Spotify have yet to be played even once. That's more than 4 million tracks.

Granted, many of these tracks may rightfully belong in the musical wasteland. But there's also the possibility of discovering a gem beneath all the rubble.

To listen, click here.