Tap the mic icon and say: “What’s this song” or click the “Search a song button.” Then hum for 10 to 15 seconds. What's the toughest new iPhone to get?: Apple's iPhone 12 Pro.

That means, whether you know all the words, or just a vague melody, you can sing or hum to the app to try and identify that song. It works surprisingly well when I tested it on the Google app for iOS.