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."
Related: If you're looking for multimedia on the Web, check out my list of the Top 10 Audio Search Engines-BitTorrent Search Engines, Free Movie Downloads, Videos.
Hi Wendy! Is there a website where Ican really download music for FREE?? Everyone I’ve tried so far,has a fee of some kind.I only get SSI,so no credit card.I just like listening to music like;Steeleye Span.It’s hard to find,except for mp3;which I don’t have.Just want to download on my comp.If you know of a place,please let me know? Thank you for your time.A Friend in CHRIST—Gus