Personally, I'm not interested in much non-English folk song (apart from the occasional Scottish song and the very occasional Irish or American song - and I do do some contemporary stuff too) not least because if my ability to understand the lyrics is diminished by language matters much of the song is not truly available to me, and also because I deeply regret the lack of interest in traditional English song, but on the occasions that I have seen African or Asian or "influenced by" players in folk song sessions, they have always been very warmly welcomed.