While not actual farm equipment, as the forwarded email (first sign of danger) from Rob W. in my work inbox said, this is nonetheless impressive...
It is amazing, but the story about farm equiptment is a hoax...it is a digital graphic: http://www.snopes.com/photos/arts/musicmachine.asp
Folks can give proper props to the creators of this, which is only one part of a whole DVD called Animusic, by buying it at: http://animusic.com/dvd-info-clips-1.html
And the rest of us can see and blog the entire section of the DVD at YouTube: http://youtube.com/watch?v=0a8DF5U2Nh4
Happy T-Day!!