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Range of mezzosoprano voice marked on keyboard.svg Author real name Artur Jan Fijakowski pl WarX commons WarX mail mailto warx gmail jabber WarX jabber org irc irc freenode net Zasig gosu Mezzosopran zaznaczony na klawiaturze fortepianu Range of mezzosoprano voice marked on piano's keyboard WarX Tessitura Musical keyboard diagrams