"World Music" is usually used as a catch-all for "non-Western", therefore "other", therefore "not as real as our music". It's a horrendous term, but conveyed the point well: Look at the wildly complete spectrum of music that's been posted in this thread! There are no shortage of genres, styles, types, cultures, histories. I think I got every continent involved here now. That's a wide variety to be in one record store bin.