Anyone gotten his book yet? Or the box set?
https://www.wsj.com/articles/playing-for-the-man-at-the-door-review-mack-mccormicks-musical-discoveries-cc304817
His riveting prose on his search for Johnson, carefully edited, was released earlier this year when the Smithsonian published a version of his book “Biography of a Phantom.” But that was hardly McCormick’s only area of obsessive pursuit and artifact hoarding. A fascinating collection of 66 of the field recordings he captured in Texas and nearby locations has just been released as a 3-CD boxed set, “Playing for the Man at the Door: Field Recordings From the Collection of Mack McCormick 1958-1971,” which includes a lavish and informative 128-page book spelling out who the largely unknown artists he found were and McCormick’s recording adventures that led to the tracks. (A 6-LP version will follow next month.) The set reveals much about what the obsessive self-made folklorist was hunting for, and lets loose hours of exciting, previously unheard music.
More on McCormick
And I had the evidence in my hands: a secret manuscript about Johnson’s life found in the archive of Houston folklorist and record producer Robert “Mack” McCormick. This wasn’t just any archive. At the time, it was one of the most sought-after collections in the country—the Library of Congress wanted it, and so did the Smithsonian and the Rock & Roll Hall of Fame. Rock star Jack White was interested in it, as were Austin’s Dolph Briscoe Center and San Marcos’s Wittliff Collections. The archive had once filled almost every corner of Mack’s home—dozens of file drawers and boxes crammed with tens of thousands of documents, photos, and recordings. Mack’s computer was full of still more files—manuscripts, plays, interviews. The archive was so vast that Mack gave it a name: the Monster.
https://www.texasmonthly.com/arts-entertainment/mack-mccormick-quest-to-find-real-robert-johnson/