%X In this commentary we raise three issues: (1) Is it motherese or song that sets the stage for very early mother-infant interaction? (2) Does the infant play a pivotal role in the complex temporal structure of social interaction? (3) Is the vocal channel primordial or do other modalities play an equally important role in social interaction? %P 516 - 517 %O © 2004 Cambridge University Press %D 2004 %V 27 %N 4 %J Behavioral and Brain Sciences %L discovery181295 %T In the beginning was the song: The complex multimodal timing of mother-infant musical interaction %A E Longhi %A A Karmiloff-Smith