"Much said about Bert is unproven speculation"

On the other hand much else said about him is supported by reliable evidence.

Neither of which has much to do with either Steve's book or the argument about whether to define folk song by origin, practice or any of the other possible criteria.

Jim, you claim that Roud has departed from a previously widely accepted definition of folk song, but exactly what definition have you in mind, who used it and where did they state it? You can't mean the "1954" definition because that one is not restricted by origin.