Studies that do not explain drummers

There's a new study claiming a link between IQ and studying music in children.

The IQ of children taking voice lessons rose 7.5 points, to an average of 111.4 from 103.8. Among children taking keyboard lessons, the rise was 6.1 points, and with those taking drama it was 5.1 points. The IQ of children who took no lessons rose 3.9 points.

There's one thing missing from the study though, What about kids who took part in an activity of similar size and time that did not involve music or drama? I'm less than convinced that there's "something" about music that inherently makes us smarter. I give you the legions of Britney Spears fans as example number 1. Perhaps there is something to be said for a child that spends an extra hours or more a week in an organized program of some kind that involves concentration, memorization, and detail that gives an extra boost when it comes time to take IQ tests. Every time I hear that music inherently does this or that I think this is probably not the best argument to it's funding. The best argument is that it is a key component of human culture and history, and ignoring it makes as much sense as a history course that skips war, or religion. And I'm not just annoyed by such causal connections being made after hearing a college classmate many years ago brag that her parents played Mozart to her in the womb. I'd like more music education in schools, but as an acknowledgement that it is something that we need to know.