Shazam
When you hear a song and wonder what it is, Shazam is there with the answer. Hold the iPhone to the music and within seconds Shazam will tell you the artist and the track name. You can use Shazam to identify music anywhere (from radio, TV, movies, or stores), save your tag history, build your own soundtrack, buy music that you hear from iTunes, watch related music videos from YouTube, personalize your tags with photos, and share your tags with friends via Mail. Note: The "Download Now" link directs you to the iTunes App Store, where you must continue the download process. You must have iTunes installed in order to open the link, and you must have an active iTunes account to download the application. This download may not be available in some countries."