What is it about Canadian women and their dominance of the American pop music scene? From Joni Mitchell to k.d. lang to Alanis Morissette to Avril Lavigne, Canadians produce an astonishing percentage of America’s favorite music. Is it the simple purity of the Great White North, as contrasted with the over-produced, predictable offerings coming out of market-driven L.A. studios? Is it savvy Canadian marketing infiltrating the Yankee sensibility? Is it just a big coincidence? Um, yes. All of that, and probably a few more things we haven’t thought of yet.