Key Signature tool icon

Noteman says: See Key signatures, time signatures, and clefs for a step-by-step tutorial overview.

With this tool, you can change the key signature in any measure. Double-click the measure to display the Key Signature dialog box, from which you can select the new key. (You can also access the Nonstandard Key Signature dialog box if you want to create nonstandard or nonlinear key signatures.) You can also specify whether or not you want any music that's already in the affected measures to be transposed into the new key.

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