Learning a musical instrument may help your child
It seems that the longer a child learns and practices a musical instrument, the better their verbal ability and non-verbal reasoning develops.
This article points to a study that says:
While these results are correlational only, the strong predictive effect of training duration suggests that instrumental music training may enhance auditory discrimination, fine motor skills, vocabulary, and nonverbal reasoning.
While auditory discrimination and fine motor skill seem like obvious traits that would improve, the latter two traits are interesting in that they are not things that we directly associate with playing music.
Of course your child is learning a musical instrument because it is fun. However, such reports are always encouraging to see. It is a pleasure to think that their hobby also helps them at school and beyond.