The Chords and Scales of G Major
Most chords are derived from scales. When you start at G in a G major scale and skip every other note, a G major chord is produced (G-B-D). Using this "tertiary" method and starting on each G major scale tone, a family of eight "diatonic" major, minor and dominant chords result. If you play all the notes of a G major scale starting on every tone, eight matching scales also emerge. This is the definition of a key or tonal center. Here are some basic exercise fingerings in G major. It can be used for a jazz warm up. More detailed information can be found in the Mel Bay book "Straight Ahead Jazz For Banjo."