Watch the Hoochie: Ex. 1a online guitar lesson by Andy Aledort from Kings of Rock & Roll Vol. 1: Johnny Winter

Texas blues master Johnny Winter studied hard the guitar styles of his heroes Muddy Waters, Howlin' Wolf, T-Bone Walker, B.B. King, Freddie King, Pat Hare, Robert Jr. Lockwood and many others in the formation of one of the most powerfully original styles ever heard. Following his first three blues-based releases, Johnny formed Johnny Winter And with former McCoys guitarist Rick Derringer and forged some of the greatest blues/rock/proto-metal ever heard. A stellar example is Derringer's "Rock 'n' Roll, Hoochie Koo," upon which this excerpt is based.
This solo is based on A minor pentatonic (A C D E G) across the first four bars, switching to A major pentatonic (A B C# E F#) at bar 5. A great many of the phrases are devised of fast, repeated phrases executed with a series of hammer-ons and pull-offs.