This is the Sequential Resonation Machine, created by Joseph Casbarian:

According to the post at
oddmusic.com, the machine is a kind of mashup of a sequencer and a pipe organ. Three MP3s on the site provide brief examples of what kinds of music it can make:
MP3,
Sorcerer’s Apprentice-style note accrual;
MP3, eerie horror shuffle;
MP3, dopey cartoon waddle. (
Via makezine.com.)