"When we saw all this activity going on precisely in sync, in this order, we knew we had the smoking gun," he said. "We've always known that music is good for improving your mood. But this showed precisely how it happens."
The subtlest reason that pop music is so flavorful to our brains is that it relies so strongly on timbre. Timbre is a peculiar blend of tones in any sound; it is why a tuba sounds so different from a flute even when they are playing the same melody in the same key. Popular performers or groups, Levitin argued, are pleasing not because of any particular virtuosity, but because they create an overall timbre that remains consistent from song to song. That quality explains why, for example, I could identify even a single note of Elton John's Benny and the Jets.
"Nobody else's piano sounds quite like that," he said, referring to John. "Pop musicians compose with timbre. Pitch and harmony are becoming less important."
Levitin's work has occasionally undermined some cherished beliefs about music. For example recent years have seen an explosion of Baby Mozart videos and toys, based on the idea — popular since the 1980s — that musical and mathematical ability are inherently linked.
But Levitin argued that this could not be true, based on his study of people with Williams syndrome, a genetic disorder that leaves people with low intelligence. Their peak mental capacities are typically those of young child, with no ability to calculate quantities. Levitin once asked a woman with Williams to hold up her hand for five seconds; she left it in the air for a minute and a half. "No concept of time at all," he said, "and definitely no math."
Yet people with Williams possess unusually high levels of musical ability. One Williams boy Levitin met was so poorly coordinated he could not open the case to his clarinet. But once he was holding the instrument, his coordination problems vanished, and he could play fluidly. Music cannot be indispensably correlated with math, Levitin noted, if Williams people can play music. He is now working on a study that compares autistics — some of whom have excellent mathematical ability, but little musical ability — to people with Williams; in the long run, he said, he thinks it could help shed light on why autistic brains develop so differently.
Not all of Levitin's ideas have been easily accepted. He argues, for example, that music is an evolutionary adaptation: something that men developed as a way to demonstrate reproductive fitness. (Before you laugh, consider the sex lives of today's male rock stars.) Music also helped social groups cohere. "Music has got to be useful for survival, or we would have gotten rid of it years ago," he said.
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