Robert Johnson's records mastered at wrong speed?

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?
Now Columbia/CBS/Sony or whoever owns those masters now can re-sell them again !I think we should get some rebate or exchange-you can see it now..."the REAL Robert Johnson"
I was fortunate to have known and recorded,both live and in the studio,the late great Bluesmaster Johnny Shines.Shines was a "running partner" of Johnson's in the 1930's and he taught Johnny his repertoire,which Shines performed throughout his career.The "slowed down" versions of these Johnson recordings were dead on to the Johnny Shines versions i recorded in the early 1970's.Now we have to check and see if any of the Jackson Pollack's are actually upside down.
I hope this turns out to be true. Still two different recording sessions and was only Robert Johnson sped up? My general skepticism give me pause......

I go in and out of country blues phases, and though I have the 2 LPs and the CD box, I've never been a RJ fan. Much to my damnation and derision from fellow blues fans. Maybe the record speed explains they high-pitched hokum of "They're Red Hot." Maybe there was an innate audio reason for my keeping RJ at arms length? In any case, if it is true I'll buy the remastered set and listen to the "new" Robert Johnson.

I wonder if they slowed down Barbecue Bob on his 78's?

Was not familiar with Johnny Shines - thanks for the info. So I read that his 40's and 50's recordings were never released? Wonder what became of them? Where can I find your recording of shines - label? Thanks
There's been controversy about this for years. It was common to speed up recordings due to both commercial and technical reasons. 78s held only 3 minutes and getting a more upbeat, commercial sound was desired. It's also been endlessly debated what guitar tunings RJ utilized. That debate strongly influences the overall speed issue. My opinion is that nobody will ever definitively know the exact speed he played during these sessions, which may be different than what he played in juke joints.

Fortunately, with modern digital tech it's fairly easy for anybody to experiment with slowing the songs down. I suggest you start at less than a 20% reduction. My impression is that his vocals sound much better, but the guitar playing, particularly his rhythmic drive doesn't sound right.
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.