I assumed given the length, and now having compared it with your version in the Bodleian (I was having trouble with response from the Bodleian (or my server) when I was looking last night) which is word for word the same (including the spelling plow omitting 1 of the broadside verses, that the Silverman text was manuscript rather than oral, with tune appended by him. But I agree it would be nice to know.

Mick