MelodyCatcher & Musipedia: A Different Kind of Music Search Engine

I recently came across this website, which is really interesting.
MelodyCatcher.com is a music search engine, but it's unlike anything else I've seen. I've seen lyric search engines, or those search engines on phones that will recognize what song is being played. This is entirely different though: you input notes in standard notation.

The technological idea is pretty cool: input a bunch of notes, search for midi files that have those note intervals (so it can be in any key), and if there's a match it lists them.

However, the usage is not as intuitive as the site seems to think: In my personal opinion, you have to be pretty good at playing by ear to be able to transpose things note by note. However, it's really useful if you already know how to play a specific piece on an instrument....but you can't remember what the name of the piece is.

Alternatively, this is a neat way to see if something you've written is a song that already exists!

------

Edit:

Also, check this site out: Musipedia.org

It's a similar, but more expanded music search engine. It not only does a search based on a similar criteria as the one mentioned above, but also for rhythm patterns, the contour of a melody etc. It's pretty cool.