The formula for the major 7th chord is:
So a Cmaj7 chord contains the notes C - E - G - B, and an Amaj7 chord contains the notes A - C# - E - G# .
The major 7th chord arpeggio forms the following patterns on the fretboard:
This pattern can start on either the 4th or 3rd strings.
The formula for the minor 7th chord is:
So a Cm7 chord contains the notes C - Eb - G - Bb, and an Am7 chord contains the notes A - C - E - G.
The minor 7th chord arpeggio forms the following pattern on the fretboard:
This pattern can start on either the 4th or 3rd strings.
The formula for the 9th chord is:
So a C9 chord contains the notes C - E - G - Bb* - D, and an A9 chord contains the notes A - C# - E - G - B.
The 9th chord arpeggio forms the following pattern on the fretboard:
This pattern can only start on the 4th string.
*Do not confuse major 7th chords with 7th chords (dominant 7th).
The following chord progression, using major 7th, minor 7th and ninth chords is a "Jazz" variation of the turnaround.
As a variation to the previous bass line, scale notes can be added.