I believe you are taking the wrong approach ,go and listen to other source singers like HarryCox, Samlarner,Fred Jordan,Phil Tanner,Jeannie Robertson,then listen to revival singers like Ron Taylor,Kevin Mitchell,Rosie Stewart,Peta Webb.then if you are particuarly struck by a song learn it for that reason.,and that reason alone
Jim Carroll called me a philistine,because I said that listening to revival singers was equally important as listening to source singers.Jim that comment was insulting.
Nick to be able to judge something for yourself is more important than slavishly following other peoples opinions.Music is about what turns you on,you may prefer to listen to Missippi John Hurt[source blues singer]nothing wrong with that if you do,but youwont know until you have listened to alot of source singers, revival singers ,or even source singers from a different tradition.