Shazam, an application indispensable

Shazam is in my opinion one of the "must" and main interesting applications for iPhone and iPod touch.
This software allows the identification/ recognizing of songs, as well allows to get informations about the author who composed the song.
The application is very easy to use, as you just have to orientate your handset to the source of music ( Hi-fi, TV, radio...etc), and push on "tag". Then the tag is directly sent to iTunes, so that you could buy the song you want.
The application requieres of course a wifi, Edge or 3G connexion, and is available for free in the AppStore.