These are my own best guesses at what I think the actual speed of the recordings should be. To me the slower speeds sound much more natural. Some say they are 20% too fast but that seems unlikely. More likely is they are 10-5% too fast. The key
to the whole thing is the vibrato of the voice. I did these all just using my ears and tried to match each song against the other with the constant being the timbral characteristics of his voice and what a natural human vibrato would sound like. Usually when I did this the speed would fall into a natural blues key like A or E, sometimes
with a capo on the first fret. Again, these are just my personal opinions and please don't get offended and send me a bunch of musicologist stuff. These are just for fun. These were done in Cubase by resampling so the pitch and the tempo were changed together naturally just like you would slowing down analog tape. Personally, the more I listen to these slowed down versions the more obviously unnatural the CDs sound.
But listen and decide for yourself.

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