There are many occasions where I want to buy a song which I just heard, but I don’t know the title of that song. Typically, we would ask someone’s help to know the title, but I just found a cool piece of software named Tunatic that can hear a song and then identify the artist’s name and the song’s title. It’s available for both Windows and Mac OS X, and best of all, it’s free!
You’ll need a microphone and an internet connection. Just install and run Tunatic, hum the sound into your microphone and click on the magnifying glass icon. It’ll send the data to their online database and search for a match. If a match is found, it’ll return the title of the song along with a link for more information.
Tip: If you don’t have a microphone, try plugging your sound source to your computer using an inexpensive audio cable. Tunatic will work even better, since no quality loss in involved. To find what’s playing in your own computer, there is an even better option. Some sound cards allow you to select what you hear as input. To do this, simply right-click Tunatic’s window, select "preferences", then click the "Configure…" button. Alternatively, you may even plug your sound output as your sound input.
Looks like Tunatic has been around for a while. I’m not sure, how I missed such great software? I found it on Shankar Ganesh’s blog post entitled Top 10 Free Programs to make the most out of your MP3 Collection.