Question ... Martyn Wyndham-Read, who used to live on the Lyne estate (former home of Lucy Broadwood) learned the song "The Sweet Nightingale" or "The Birds in the Spring" from Captain Evelyn Broadwood (Lucy's nephew, and owner of the estate in the early to mid 20th century), who in turn had learned the song from his aunt... who had collected the song from George Grantham, the illiterate carter who had lived on the estate in the late 19th century .... so Martyn had learned the song by oral transmission in a line which ran directly from the "original" singer (who presumably had learned it from elsewhere) .... does that therefore make Martyn a source singer in this instance ???

Retires hurriedly after lighting blue touchpaper (muttering ... I'm not sure that it really matters. It's an interesting point, but what matters is the song and its onward transmission and not the singer...)