I came across the following when I was researching Scots Dictionary. It's from the Skeptics Dictionary site and in another part is scathing about Campbell.

Not according to Kenneth Steele, a psychology professor at Appalachian State University, and John Bruer, head of the James S. McDonnell Foundation in St. Louis. Contrary to all the hype, they claim that there is no real intelligence enhancing or health benefit to listening to Mozart. Steele and his colleagues Karen Bass and Melissa Crook claim that they followed the protocols set forth by Shaw and Rauscher but could not "find any kind of effect at all," even though their study tested 125 students. They concluded that "there is little evidence to support intervention programs based on the existence of the Mozart effect." Their research appears in the July 1999 issue of Psychological Science.

In his book The Myth of the First Three Years, Bruer attacks not only the Mozart Effect but several other related myths based on the misinterpretation of recent brain research.

The Mozart Effect is an example of how science and the media mix in our world. A suggestion in a few paragraphs in a scientific journal becomes a universal truth in a matter of months, eventually believed even by the scientists who initially recognized how their work had been distorted and exaggerated by the media. Others, smelling the money, jump on the bandwagon and play to the crowd, adding their own myths, questionable claims, and distortions to the mix. In this case, many uncritical supporters line up to defend the faith because at stake here is the future of our children. We then have books, tapes, CDs, institutes, government programs, etc. Soon the myth is believed by millions as a scientific fact. In this case, the process met with little critical resistance because we already know that music can affect feelings and moods, so why shouldn't it affect intelligence and health? It's just commonsense, right? Yes, and all the more reason to be skeptical.

Regards, John