1.)  Use his/her imagination, which is essential for a child's development. This fosters creativity, social skills, cognitive abilities, emotional well-being, and a sense of self.  
2.)  Improve self-regulation
3.)  Improve listening skills
4.)  Improve gross motor skills
5.)  Reading and sharing stories helps your child get to know sounds, words, and language, and develop early literacy skills. learn to value books and stories. spark your child's imagination and stimulate curiosity

I have taught children for over 30+ years and as an Education Consultant, I have trained teachers to use music in the classroom to promote skills.