Robert Johnson's records mastered at wrong speed?




http://www.guardian.co.uk/music/musicblog/2010/may/27/robert-johnson-blues

Experts say Robert Johnson's classic blues records all mastered at wrong speed - took 50 years to figure it out.... Anyone glad to hear he's not really a chipmunk?
gdoodle
Gdoodle..My Shines recordings are still unreleased and now about 37 years old.They were live radio and club recordings made in Santa Barbara,California when i started the Santa Barbara Blues society-still going as we speak.The recordings WILL be released over the next few years.The recordings Pete Welding made for his Testament label "Standing at the crossroads"-a great album-remain the truest to Shines' Johnson interpretations.Like a lot of Delta migrants Shines made it to Chicago and recorded great Electric Blues in the 50's and 60's but returned to the acoustic type of Blues in the 70's and traveled around as a solo act.Back then these guys lived on the Greyhound bus and worked out of a suitcase and a guitar case.Shines was an amazing artist and a very warm and intelligent man who loved his art and loved people.I was fortunate to have met and interacted with many of these Blues artists when i was in my early 20's,they forged a profound understanding of music on me.
JazzCourier your experiences sound truly amazing; what a fortunate circumstance in which to be involved. Thanks much for sharing
Somebody needs to run this by Honeyboy Edwards. I believe he is one one of the last people around who played with Johnson. Talk about acoustic memory, this would be a new record.
While I certainly think it is possible that they are at the wrong speed, 20% seems like a rather high number.