Tessitura
Tessitura (Italian: texture) is a musical term. It refers to a range of pitches in a particular context.
The tessitura of a composition, usually used of a vocal work or a particular voice within the work, is the general range within which the notes lie. Tessitura can also refer to the part of a singer's voice, or sometimes a musical instrument, that has the most musically acceptable and comfortable timbre.
In musical notation, tessitura is the range of notes implied by a clef.
Tessitura is also the name of a suite of customer relationship software for use by performing arts organizations.