Tessitura

In music, the term tessitura (plural tessiture; Italian, meaning "texture", and from the same Latin word: textura) generally describes the most musically acceptable and comfortable range for a given singer or, less frequently, musical instrument; the range in which a given type of voice presents its best-sounding texture or timbre. This broad definition is often interpreted to refer specifically to the pitch range that most frequently occurs within a given piece, or part, of music. For example, throughout the entirety of Wagner's Ring, the music written for the role of Siegfried ranges from C♯3 to C5, but the tessitura is described as high because the tenor phrases are most often in the range of C4 to A4.