Yes, McGrath K, 'world music' might well be a daft term but if you read through the history indicated at the link above, no-one has yet come up with a better one to categorise musics from cultures other than White European/American that are rooted in a tradition. The term does NOT include 'new age' or 'fusion', the first of which is absolutely not tradition-based and the second is by definition a combination of two or more traditions.