A piano reduction is sheet music for the piano (a piano score) that was once music for other instruments that was reduced as kind of projection to its most basic components within a two line staff for piano. It is also considered a style of orchestration or music arrangement less well known as contraction scoring, a subset of elastic scoring.
According to Arnold Schoenberg, a piano reduction should, "only be like the view of a sculpture from one viewpoint," and that advises that timbre and thickness should largely be ignored since, "the attempt to make a useful object equally usable for a variety of purposes is usually the way to spoil it completely."
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