Shazam - Five free iPhone apps

Developed by Shazam Entertainment

Equal parts recommendation engine and shill for iTunes, Shazam enables users to efficiently discover, purchase and share new music simply by holding their iPhone in front of an audio source. The free Shazam app tags and identifies songs from across iTunes' library of 5 million tracks, regardless of whether the source music is on the radio, TV, a movie, store or jukebox--user playlists grow with each new song Shazam pinpoints, and connects the iPhone directly to iTunes to preview or purchase the track in question. Users may also screen related videos via YouTube and email song details to friends. You'll never mistake Jay-Z for Young Jeezy again.

Watch a demo of Shazam here: Video