Major with a ♭7: the I–♭VII–IV rock sound (Sweet Child O' Mine). Same notes as the major key one step counterclockwise on the wheel (G Mixolydian = C major).
Positions: the five CAGED shapes, each built around a pentatonic box with the other two notes slotted in. One finger per fret, with the odd stretch. Each one shares its edge notes with the next. Dots show scale degrees: 1 is the root.