dupla scale

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Organum — This article is about a style of music. For the musical instrument, see organum (musical instrument). For the experimental music group, see David Jackman. Organum ( /ˈɔr … Wikipedia
Time signature — Common time redirects here. For the short story, see Common Time. Simple example of a 34 time signature: here there are three quarter notes per measure. The time signature (also known as meter signature) is a notational convention used in Western … Wikipedia

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