As noted on YouTubes support page, the video-sharing platform is testing a search-by-song capability on the Android version of the app that allows users to figure out a song on YouTube by humming, singing or recording a song, TechCrunch reported. Users who have access to the experiment can toggle from YouTube voice search to the new song search feature and hum, sing or record a song for three or more seconds. The search-by-song capability is only available to a small portion of Android users