I was expecting something about the genre "world music" as it exists in some record stores but instead there's a lot of musings about ethnomusicology, at times even personal musings. I had also expected something about music genres that have gone global, like reggae, rock, salsa, or the waltz, and there was a tiny bit about that. There's plenty of concerned signaling about power imbalances, indigeneity, diaspora but not any real owning up to it. Frankly, Oxford asked the wrong guy. He edited a Cambridge History of World Music and he's doing a lot of history here, but as a Very Short Introduction, I think it misses the mark.