Gallery: Top 10 free iPhone applications

If you've ever heard a song on the radio and wondered what it was, Shazam is for you. It's a super-trick application that listens to a track being played on the radio (or over the PA in the department store for that matter) and tells you what track is playing.

Shazam can identify music from radio, film, TV or even in a store. Remarkably, it performs amazingly well even driving down the highway at 65MPH with the windows down.

Once a song has been identified you can tag it to build your own soundtrack, see related videos and even forward tags to your friend. It's brilliant and definitely worth the download.