Here's a quote from a research paper by Professor Susan Hallam, Institute of Education, University of London.

[There is] a strong case for the benefits of active engagement with music

throughout the lifespan. In early childhood there seem to be benefits for the development of

perceptual skills which effect learning language subsequently impacting on literacy which is

also enhanced by opportunities to develop rhythmic co-ordination. Fine motor co-ordination

is improved through learning to play an instrument. Music also seems to improve spatial

reasoning, one aspect of general intelligence which is related to some of the skills required in

mathematics.

You can read the whole paper, The power of music: its impact on the intellectual, social and personal development of children and young people or look for references and articles about it on the web, there are plenty. Or just read on and take away the point I want to make: Musical playtime is a vital part of your young child's daily routine. Like spinach, even more so, musical activities shared between you and your child are wonderful ways to bond with your child and to help your child's developing mind and developing body. Plus, music-making is a lot less messy than, say, creamed spinach and a LOT less green.