Azizi, it is true people here are from North America, Europe, Australia, and New Zealand--and that is all over the world. But culturally, the vast majority of posters here are Anglo, Anglo American, Anglo Aussie, or Anglo Kiwi (almost unanimous with few exceptions, in fact, like Wolfgang and our friend from Iceland). There is a reason why historians refer to the US and Canada as "British North America".

The discussion of music here is almost exclusively Anglo American and Anglo from the UK, in other words. Hence, not so diverse.

Not much discussion round here of non-Anglo American music cultures like Cajun, Acadian, Tejano, etc etc etc...or Maori music, or the Australian aboriginal music cultures. Or even of Irish, Welsh, Scottish, or Breton Celtic music cultures for that matter (though the folks interested in the Anglo tradition are often also interested in the Celtic music cultures and vice versa). The folks with interests in the Celtic music cultures congregate elsewhere on the web, and would most definitely describe this website as "British and American" with "American" being their default setting for Anglo American.