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Having been previously acquainted with several esoteric programming languages (here, here and here), we enjoyed this introduction to Velato courtesy of Futility Closet. Using MIDI files as source code, compiled by Daniel Temkin (see above) in 2009, the syntax provides a unique challenge with constraints (see also) for achieving the desired output and something melodious. The pictured lines of code produce, “Hello World,” the standard programming benchmark plus sanity check to make sure the logic holds. Hear the programming and find related languages at the link above.