
Diamanda Galás is an American avant-garde composer, vocalist, pianist, organist, performance artist, and painter. Galás has been described as "capable of the most unnerving vocal terror", with her three and a half octave vocal range. Her works largely concentrate on the topics of AIDS, mental illness, despair, injustice, condemnation, and loss of dignity.

Yma Sumac (September 13, 1922 – November 1, 2008) was a Peruvian soprano. In the 1950s, she was one of the most famous proponents of exotica music.
She became an international success based on her extreme vocal range, which was said to be "well over four octaves" and was sometimes claimed to span even five octaves at her peak. Yma Sumac recorded an extraordinarily wide vocal range of slightly over four octaves from B2 to C♯7 (approximately 123 to 2270 Hz). She was able to sing notes in the low baritone register as well as notes above the range of an ordinary soprano. Both low and high extremes can be heard in the song Chuncho (The Forest Creatures) (1953). She was also apparently able to sing in an eerie "double voice".
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