"i find it important to listen to source singers,"
Listening to the poor phrasing and the lack of understanding exuded by may of today's 'folksingers', that should be compulsory - most of the older singers excelled in making the songs work narratively and logically
Some of the 'breathy little girl' women singers who sing from parts of their body unknown to man could learn a lot from Cecilia Costello, or Sheila Stewart or Maggie Murphy or ANNIE MACKENZIE singing an "old shepherd's song from the 16th century"
As they used to say in The News of the World "All human life is there"
Jim