Whenever you hear a tune you like, simply hold your phone's microphone to the speaker and hit the 'Tag Now' icon. Shortly after, details of the song will appear in the Shazam interface, including the name of the song, the singer, and the album it appears on.
But how can Shazam know so much about all this music? Well, Shazam 'hears' the song through your phone's microphone and uses your mobile internet connection to compare the sounds it receives with those recorded in a huge online database of music. If it finds a match Shazam will provide you with the information immediately, and offers you the ability to email it to a friend if you wish. While Shazam can't recognize every song in the World, it managed to get most we tested it with.
The interface in the Android version of Shazam is very simple to use, and it only takes a few seconds to look up a song.