If a song is playing, Shazam can tell you what it’s called and who sings it! It even works pretty well in noisy places, like malls or parties.
Also, if you open it while the show Beat Shazam is on, you can play along and try to answer the questions! (You can’t win money, though — unless you win the sweepstakes. But, it’s kind of fun anyway.)
I’ve used this app for years and it’s simple but definitely one of the most amazing and useful apps on the App Store.