It appears that if you search for trends: "Country Music, Folk Music" the Country Music dominates the determination of the localities that are reported, and Folk shows up pretty weak; but if you search trends: "Folk Music, Country Music" what's actually shown is the popularity of the two searches in localities where "Folk Music" is "biggest."

There also seems to be some difference if you search one term first, and then add the ", second term."

I think we could work up some seriously biased reports with this awareness, if it holds up to further trials.

John