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I've been keeping up with news of Steve Earle and lately, on
Earle's main site, learned that the
newest bio-documentary on Johnny Cash includes an interview with Earle about Cash. I'm DVR'ing the bio on
Biography (cable) and will catch Earle talking influences--Earle who has been far more overtly political than Johnny C ever was but otherwise derives a great deal from this gone elder.
I also recommend
this YouTube video clip - a contemporary montage of Cash's dark view.