According to a YouTube description:
This incredible machine was built as a collaborative effort between the Robert M. Trammell Music Conservatory and the Sharon Wick School of Engineering at the University of Iowa . Amazingly, 97% of the machines components came from John Deere Industries and Irrigation Equipment of Bancroft, Iowa.
It took the team a combined 13,029 hours of set-up, alignment, calibration, and tuning before filming this video but as you can see, it was well worth the effort.
It is now on display in the Matthew Gerhard Alumni Hall at the University and is already slated to be donated to the Smithsonian.
The tune is “Sail Away (Orinoco Flow)” by Enya.