Cocorosie is an American avant-garde musical duo consisting of sisters Bianca "Sierra" Casady and Sierra "Coco" Casady. Their music combines elements of folk, hip-hop, electronic, and experimental music, and often features unusual and unexpected instrumentation like toy pianos, theremins, and kazoos. Cocorosie also frequently uses handheld vocal effects like layering and pitch-shifting to create an ethereal, child-like vocal sound.

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