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Why do we sing to babies? Human infants are relatively altricial and need their parents' attention to survive. Infant-directed song may constitute a signal of that attention. In the rare genomic imprinting disorder Prader-Willi syndrome (PWS), typically paternally-expressed genes from chromosome 15q11–q13 are unexpressed, resulting in exaggeration of traits that reduce offspring investment demands on the mother. PWS may thus be associated with a distinctive musical phenotype. We report unusualdoi:10.31234/osf.io/6269f fatcat:q3hdmjgcyzfthikl5iy5vxkr6e