You know, I follow the European charts quite a bit, and I don't remember the last time I heard an organ instrumental hit the top of the pops!

This is no more the 'European sound' than bluegrass is the "American sound'! It is liked by quite a few people, and players, but has no real impact on what is actually selling in any great numbers. In fact, I'd be willing to say that bluegrass is a LOT more popular than cheesy organ instrumentals