Not too fast! Sharp was not the only collector and he died in 1924. There's a vast repertoire out there that came from 'traditional' sources that are nothing to do with Sharp. Yes, he collected many 'trad' musicians ~ both morris and country dance: as far as English Country Dance Books and what is generically called 'Playford' is concerned, yes a great many dances and tunes came from the Dancing Master series.

Tom