What is tessitura?

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.

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Some articles on tessitura:

Voice Type - Male Voices - Tenor
... Tenor tessitura The tessitura of the tenor voice lies above the baritone voice and below the countertenor voice ... The Leggiero tenor has the highest tessitura of all the tenor sub-types ...
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 ... 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 ... In musical notation, tessitura is used to refer to the compass in which a piece of music lies—whether high or low, etc.—for a particular vocal (or less often instrumental) part ...
Cornettino - Tessitura
... The tessitura or compass/range of the cornettino is c' to around g"' ... A player with a strong embouchure may be able to coax higher notes from this instrument ...
Soprano Sfogato - Origin
... periods, distinctions between voices were not based so much on the range as in the tessitura and color of the voice ... Their range was often blurred, relying more on tessitura to cast different roles in opera ... Virtuosity was shown by quick-silver agility, changes in register and tessitura, perfect control of dynamics and tonal coloration, not by whistle-like high notes ...
Soprano Sfogato - Roles
... for the roles associated with this voice type are widely varied tessitura throughout the role, extended segments lying well into the low mezzo or contralto tessitura and segments lying in high soprano ...