Welcome to the world premier of the Second Origami Symphony! Just as in a musical symphony, an origami symphony is an elaborate composition in usually four movements of various themes and styles that flow together. As a musical symphony brought music to new heights, I wish to do the same for origami. Contained in this work are 38 original models, each a masterpiece by origami master John Montroll. Each model can be folded from a single square using standard origami paper. Themes include sea creatures, peaceful creatures, Archimedean Solids, and prehistoric mammals. Models include a Sailboat, Ocean Liner, Orca, three Sharks, Unicorn, Panda, Koala Bear, Cubehemioctahedron, Glyptodon, Smilodon, and a Woolly Mammoth. All are of varying levels of difficulty and structured as a symphony in four movements. First Movement: Allegro Agitato: Sharks in the Sea. Second Movement: Andante: Dulce, Peaceful Creatures. Third Movement: Minuet of Dimpled Polyhedra with a Trio of Archimedean Solids. Fourth Movement: March of the Prehistoric Mammals.