There's just so much to learn. One of my fave LPs of all time is Gillian Welch's The Revelator.
Surfing and found a reference to Blind Willie Johnson's John The Revelator. Gillian took her Revelator from there.
To really write about western music, you need to know the Bible.
To know the blues, you need to know the Bible.
Life long learning.
p/s: go get Nick Cave's new album with Warren Ellis - White Lunar.