The Great American Horn Machine

(YouTube Link)

At a discussion forum called the Horn and Whistle Board, user captofchaos revealed this glorious machine that he has constructed. The Great American Horn Machine has a 620 gallon air tank and an air compressor that powers numerous ship and train horns. The video above is a demonstration of this musical instrument playing "God Bless America."

http://www.hornwhistleboard.com/viewtopic.php?f=5&t=2386&st=0&sk=t&sd=a&sid=daafa489b24865b78ea40e9d9339bff4&start=30 via Gizmodo