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We study some musical and expressive features of traditional Wor vocal music, an ancestral gender of the Biaks (West Papua). A core aspect in Wor songs is the expression of wonder, which Biaks have developed into an Aesthetics of Surprise. We describe some key structural features in the pitch and time domain used as means to express such an aesthetics. We represent the acoustic and prosodic features encoding expressive content by means of an Expressive Function which contains expressive indicesdoi:10.5281/zenodo.1289536 fatcat:b2gppuc4w5c2dg6qsei2c6qc24