This was announced yesterday in Google's official blog. It relies primarily on voice search techniques that have been further improved, especially for music and song search. That's why this feature can be introduced in Google Voice Search under the title "Search A Song".
In addition to humming whatever song you want to find, you can also whistle in this way, Google will still search for similar tunes or songs.
According to the Google Blog, each song and lyrics has some unique features that can be called "fingerprints".
The algorithm of the "Hum to Search" feature is so intelligent that it compares the "fingerprints" of your humming melody to the specific fingerprints of other melodies and songs, and similar melodies in seconds and Displays the song in "Search Results".
Currently this feature for Apple iPhone only supports English songs, however in all other smartphones with Android this feature can find songs in 20 languages.
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