Now theres a way to find out.
To access it through the app, tap the microphone icon and say “Whats this song?”
Selecting the “Search a Song” button also works.

laflor / Getty Images
To work correctly, the feature requires you to hum for at least 10-15 seconds.
“But once it is recognized, roughly four out of five answers are correct.”
There are several reasons for this, explains Google Researchs Christian Frank in aNov.

Plus, you dont need perfect pitch to use it.
“This song corpus still has room to grow to include more of the worlds many melodies.”