I used to argue that there was no such thing as a World Music style, in the sense that, say, indie music or trad jazz are fairly sonically delineated. But now I’m not so sure. Over the past decade or so, most cosmopolitan cities in the world have probably produced at least one band with a line-up that invariably includes an accordion player, a double bassist (rather than a bass guitarist), a violinist (just the one), maybe a horn player or two, and a multi-lingual vocalist.