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A form in two parts, each usually repeated. The first generally modulates from the tonic to a related key, ordinarily the dominant if the tonic is major, the relative major (less often the dominant minor) if the tonic is minor. In short binary movements there is often no modulation, the first part merely ending with a half cadence. The second part reverses this motion, progressing back to the tonic either directly or via one or more additional keys (New Harvard Dictionary of Music)