Tap the waveform icon, circled above, to search with sound. | Screenshots: YouTube MusicThe Android YouTube Music app is rolling out a feature that’s part Shazam and part your friend when you say, “hey what’s that song that goes…” right before you hum out a bar. The feature lets you hum, whistle, sing, or play a recording of a song to figure out what it is.If you have the new feature, you’ll see a new waveform icon next to the microphone icon that appears when you tap the search b***on in the upper right corner of the app. Tap this, and the app will start listening. It’s not too shabby, either! When I tested, it was able to identify actual recordings with what seemed like uncanny speed, making it a great replacement for Shazam. As far as listening to me hum, it accurately picked out most of the songs I sang, whistled,…