"Going to the Well for Water. The Seamus Ennis Field Diary 1942-1946"
Written as a diary, ("12th June: rose at 10, repaired a punctured tyre and went to visit...") so not a cover-to-cover read but absolutely fascinating to dip into.

"Alan Lomax: The Man Who Recorded the World"
Very readable biography and links to the above when Ennis sort of acts as his guide on a visit to Ireland