One of the reasons why people look at passing international treaties about this sort of thing is because of first world exploitation of third world musicians. An example of how it happened here is the now very famous story of how Alan Lomax ripped off Leadbelly. The problem is with the collectors and harvesters of music in poor, out of the way places. It isn't about making a few bucks off the local session and gigs, in my view. Not at all.