These song from Johnny Winter And, studio production recorded 1970 in one day. His group then was the same guys that did "Hang on Sloopy"
This last cut between 1:30 and 2:00 minutes IS the fastest guitar riff I have ever heard. Had a contest once where three of us picked the fastest guitar playing we could find. I picked this one, and my friends chose Jimi Hendrix and Jimmy Page. Johnny winter won with this tune hands down. They used to say that he could play faster than most guitar players could think. Here is the tune