Watch the The Major Scale online guitar lesson by Frank Vignola from Next Steps Jazz: 2-5-1 Progressions
This simple combination of notes is the most commonly heard in music. It is a rumor that you need to know hundreds of scales, modes and theories before playing jazz but that's just not true. This moveable formation of a G major scale will be enough for you to make the swinging music you want. Play this scale often and move it up and down the fretboard.