@ Steve: by the way, I know that I am not so well-informed as some on this site, but my interest is genuine and I do have some knowledge of the literature. I know about the discussions on Percy, for example, one of the people Child drew on. In fact Child worked very hard to get hold of Percy, did he not? By the way, my educational background in case this is of interest is that I 'majored' as they say in the US in English and Psychology (hence the interest in social science research methods, which overlap with those of ethnomusicology to some degree). I know some theory of music, play piano and guitar (badly) and used to play melodeon for traditional clog dancing. I am also interested in politics: I once read a book with a lot about Trotsky in it, by a US sociologist called C Wright Mills, but have forgotten almost everything about it, it was about four decades ago, and I know some current SWP members, (very good on anti-racism they are too) so I have a rough idea where Harker is coming from viz a viz the CPGB.ñ