tessitura

noun

1. (countable, uncountable)The most acceptable and comfortable vocal range for a singer or musical instrument; the range in which a given type of voice presents its best-sounding timbre.

   “Byrne shrugged. He started writing a bravura / Opera based on Cleopatra’s death, / Exploiting all Maria’s tessitura, / With a high F before her final breath.”

   “Anne's talented voice made the lines I had written swoop, howl, and whine through an authentically Thatcherite tessitura [...].”

   “In classical voice training, and in the world of classical singing, voices are divided into categories dependent on timbre or tonal colour and tessitura or comfortable average pitch range.”