Watch the Johnny: Ex. 4b online guitar lesson by Andy Aledort from Kings of Rock & Roll Vol. 1: Johnny Winter
In this second example of Johnny's slide style, I begin in "open" position, utilizing the open top two strings along with "fretted" notes. In the latter part of the solo, I repeatedly pick across the top three strings in a descending manner, from the first to the second to the third string, while vibrato-ing with the slide, laying the slide across the 15th fret. This is a great way to build tension up in a solo. The solo ends with multiple-string pull-offs on the top three strings.