Check out Musipedia , "a searchable, editable, and expandable collection of tunes, melodies, and musical themes." At the time of this writing, Musipedia had over 30621 melodies and musical themes in its database; with new ones being added every day. One of most intriguing features of Musipedia is its Keyboard Search . You can search for music actually using the notes on the piano to guide your search - this is the first time I've ever seen anything even remotely like this and I just thought it was way cool. In addition, you can search for music by whistling a tune (no joke). From the site: "The applet at the bottom of this page can analyze your whistled input and calculate the Parsons code, which you need for a search. For some people, singing works better than whistling. It is also conceivable that certain musical instruments work still better."