Yma Sumac recorded an extraordinarily wide vocal range of slightly over four octaves from B2 to (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"