This greasy riff

I love this greasy, grinding riff (or lick, or motif, or whatever the stratocaster-playing lawyers who run everything are calling it these days).  It has long since been run into the ground by the giant-beer-company-sponsored, neatly-trimmed-bearded legions of "blues" "musicians" all over America and the world, but these variations on it still sound pretty good to my ears and hopefully to yours:

Little Richard- Directly From My Heart
Don and Dewey- Pink Champagne
Howlin' Wolf- I Walked From Dallas
Hound Dog Taylor- Sadie