I think I have seen similar threads in the past but.
Music travels very well,Once every hall or grand house would have had musicians to entertain the lord and his guests.
The lord would get fed up if he heard the same things performed so new material was needed.
Itinerant groups of travellers went from place to place performing plays,songs and the like. you can soon see the singers/musicians getting together to exchange songs/music,[very much the way we do here at MC], and if you did not like the way it sounded you simply changed it, thus within a few years music could travel across continents. Now with modern technology everything is instant.
wildlone