English: The Green square is the Middle C (C4) and the Blue square is the High C (C6), which is the typical vocal range for a soprano. The Red squares show Callas's vocal range in performance, going from F-sharp (F#3) below Middle C to E-natural (E6) above High C.
Català: El quadret verd és la C mitja (C4, Do central) i el quadret blau és la C alta (C6, un Do, dues octaves més alt que l'anterior), aquesta és la tessitura típica d'una soprano. Els quadrets vermells mostren la tessitura de Maria Callas, que anava de F#3 (Fa sostingut) per davall del Do central fins a E-natural (E6, el Mi natural sobreagut) per damunt el C (Do) alt.
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