Music and Cognitive Ability

Honest debate impels me to include points of view which do not match my own. In this regard here is an article in which it it stated that parents who invest in music lessons for their children, in the hope of improved academic ability, are wasting their money. Whether or not you agree with this does not change the fact that having instrumental lessons, not through love of music, but in the hope of improving other abilities does seem an odd approach – why not just study harder?