So... I stumbled upon this today:

http://biancavirina.tumblr.com/post/2665295375/click-the-squares-the-whole-world-needs-to

Just click various squares and hear harmonious music.

I bet he just found it when Vagabond posted it in IRC... >_>

Also, as was said in the chat, while not the same, it has an uncanny resemblance to the Tenori-On, right down to being a 16x16 grid. :P

pretty awesome.

That is so fun - Thanks

That thing is way too addicting. At some point I was even drawing random logos (such as space invaders) and I came up with interesting melodies.

I cannot stop making Waddle Dees! O_O The music is quite similar to the stupid dance from Brawl.