What’s that song? Just ask your Mac: Music recognition specialist Shazam launched an OS X app Thursday that automatically listens to and identifies any music played in the background. It’s the first time Shazam has ever targeted desktop computers after exclusively focusing on mobile apps and services for more than a decade.

The new app installs a small icon in the OS X menu bar. Upon opening, it asks users for permission to access the microphone and listen for music, and then automatically tries to recognize each and every song played within reach of the computer. Successfully recognized songs are added to a list, giving users the option to learn more by visiting a song page on Shazam.com, or switching to iTunes (S AAPL) to buy the title right away.

Shazam’s OS X app in action.

But the app doesn’t just listen to your Mac’s microphone. It also keeps tab of…