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Learning To Read Music Tutorial 2

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Music notation shows what scale is primarily being used by means of the key signature.

Use of the key signature is largely a matter of conceptual efficiency. For example, if a piece (or section of a piece) of music is primarily using the notes of the G major scale, then that piece (or section) is said to be in the key of G major. Rather than write sharp symbols (#) in front of every single F-sharp note that comes along in the music, like this:

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Learning To Read Music Tutorial 2