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It seems like one could replace many of the markings in sheet music with color. Dynamics could be indicated by changes in hue or saturation; gradual change would represent a crescendo or decrescendo. Accents could be indicated by a sudden change on one note. Staccato could have a special color. Phrases even could be grouped somehow. You get the point.
Unfortunately, I've never seen any sheet music printed in color except in books for beginners. Does anyone know of any large works of music set in color like this?