Music which is 'rooted in a tradition' is not necessarily a criteria that determines whether or not I listen to it. I don't listen to bluegrass because I don't like it (and I played in an old-timey band once). I said it was not 'rooted in a tradition', meaning that it emanates from certain elements of several and is thus a manufactured genre which would not, here in the UK anyway, come under the umbrella of 'world music', any more than wifty-wafty, new-agey, celticky, stuff does.