I was wrong about Jim and Bertrand, for they were not my first exposure to world music, if by "world music" you mean anything/everything outside the US of A. No, it was the British folk band Pentangle, like so:
Oddly enough i only discovered Pentangle fairly recently. I was looking for a band called 'OUTBACK' from the 80s... and picked up 'PENTANGLING by PENTANGLE' at the same time.... i like them.... and folk is not my usual thing...most be getting more mellow as i age!
I also like Bonnie Dobson!