There is a cool service called Shazam, which take a short sample of music, and identifies the song. There are couple ways to use it, but one of the more convenient is to install their free app onto an iPhone. Just hit the “tag now” button, hold the phone’s mic up to a speaker, and it will usually identify the song and provide artist information, as well as a link to purchase the album. What is s
![How Shazam Works](https://cdn-ak-scissors.b.st-hatena.com/image/square/3d00541a99cca5023ee2d10a3e868b25ec3bce74/height=288;version=1;width=512/https%3A%2F%2Flaplacian.wordpress.com%2Ffiles%2F2009%2F01%2Fshazam-spectrogram.jpg)