This lesson is about something that many players already do intuitively without even thinking about it or realizing they’re doing it, and that is using what I call the “all-purpose passing chord,” which is simply strumming one or more open strings when switching from one fretted chord shape to another.
For example, in the laid-back intro and verses to Soundgarden’s Blow Up the Outside World, when changing from an open E chord to C every two beats, guitarists Chris Cornell and Kim Thayil would momentarily lift their fretting fingers off the strings during the last 16th note of the beat that precedes the next chord and strum the open top four strings with an upstroke.