[plaguuuuuu]

Interesting. AFAIK musical ability is somehow linked with mathematical ability, yet Williams Syndrome involves mathematical impairment..?

[dllthomas]

These aren't necessarily in conflict. Imagine a system,

    x = A + B
    y = A - B

If, typically, we see large ranges of A and small ranges of B, we'd say x and y tend to move together. But that doesn't preclude someone with a highly unusual B.