Let me start by saying that this really is an amazing piece of software. The concept is a simple one, and is executed brilliantly. There have been a countless number of times when I've heard a song on the radio, or in a shop, or in a bar and I can't remember what it is, or sometimes it's my first listen of it and I want to find out what it is so I can get it from iTunes.

That's where Shazam comes in - it listens to what you're listening to and then tells you what it is, complete with links to buy it from Amazon or iTunes.

Simply amazing. If you like music, I'm sure you'll like this application.

Surely one of the coolest and greatest iPhone Apps.

Here's how it works. You hear a song on the radio or on a jukebox or on the street that you like. You don't know who sings it. You turn on Shazam and it tells you what the artist and track by detecting the music via your phone's microphone.

This app is not that helpful for iPod Touch users because you have to plug in an external mic.