If you hum, or sing a song, newly launched search engines like Midomi will likely recognize what you’re singing. So if you get a song in your head, and you don’t know what it is, go to Midomi. It will show you the most likely results, based on the signatures of songs it has in its database, and lets you go to a store to buy them.
That’s just the beginning. Midomi lets you see the people who have hummed the same songs, showing you those who sang most similar to you. It lets you chat with those people through a message box. It also lets you store your tune in its database for others to hear.