Seagull M4

Strings are listed from low to high. Select a string to hear its target pitch. Tune the doubled melody strings in unison.

The diagram shows the neck as you look down at it while playing. The zero fret is at the top, with frets 1–7 below it. The bass course is on the left, the drone is in the middle, and the doubled melody course is on the right. The two melody strings are shown as a pair and are fretted together.

• A filled marker means press the course behind the numbered fret.
• A hollow marker above the zero fret means play the course open.
• The drawing uses proportional fret spacing. On a D course, frets 1–7 sound E F# G A B C# D. The same major-scale spacing begins from each course's open note.

Each course follows major-scale fret spacing from its own open note. The three major profiles use I ii iii IV V vi vii°; D–A–C produces D Dorian and uses i ii III IV v vi° VII. A tuning may still supply notes outside its displayed key. In D–A–D, for example, fret 6 on the A course produces G#, making E major available under Chromatic extras.

• Changing the tuning changes the available scale and chord set.
• Power contains the root and fifth. Diminished chords do not use this label because their ♭5 distinguishes them from a power chord. Triad contains the root, third, and fifth. 7th identifies a three-note seventh-chord shell. Major, minor, and dominant seventh shells omit the fifth; half-diminished shells omit the third and retain the ♭5. Shell marks a seventh-chord shape used when the tuning cannot produce the named triad.
• In D Dorian (D–A–C), B natural is the mode's sixth. A and A7 borrow C# from D harmonic minor. E major adds G# and functions as V/V, the secondary dominant of A.