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A tiny instrument tuned in fifths
The mandolin has eight strings in four pairs, called courses, tuned G3, D4, A4, E5 from low to high. Each step between courses is a fifth, seven semitones, which is the same relationship as a violin. That tuning shapes everything about the instrument: scales fall into regular patterns, chord shapes move cleanly across the neck, and a shape learned in one place works in many keys.
The tool above draws a real chord diagram for any chord you choose. Pick a root and a chord type, and it finds a low, playable fingering where every sounded note belongs to the chord, then draws it with the frets, the finger positions, and the note on each course. The diagram is computed, not pasted from a picture, so it works for every chord type in the list.
Reading a mandolin diagram
The diagram shows four vertical lines, one per course, with the lowest course on the left. The thick bar at the top is the nut. Circles above the nut mean open courses; dots on the lines mean pressed frets, with the fret number inside the dot. Under each course, the tool names the note that sounds there.
Because each course is a pair of strings tuned together, you press both strings of a course with one finger. That doubling is the mandolin’s voice: two strings sounding as one give the bright, chorus-like ring that cuts through a band. It also means your fingers do double duty, so clean placement matters more than force.
Why fifths tuning makes chords movable
In fifths tuning, moving a shape up two frets raises it by a whole step, and moving it across one course raises it by a fifth. A G major shape slid up two frets becomes A major; slid across one course it becomes D major. Once you know a handful of shapes, you can play in any key by sliding rather than by memorising twelve versions of everything.
This is also why mandolin players love two-finger and three-finger chords. A simple shape with the root on the lowest course and the fifth and third above it already sounds complete, because the doubled courses fill the sound. Full four-finger chords exist, but the instrument rewards economy.
Chop chords and rhythm playing
In bluegrass, the mandolin often plays chop chords: short, percussive stabs on the offbeat that act like a snare drum. Chop shapes are usually four-finger closed chords with no open strings, so they can be muted instantly by releasing pressure. The tool’s fingerings favour low positions, but any closed shape it shows can be used as a chop shape by damping right after the strum.
Chop playing is where the mandolin earns its place in a band. The notes matter less than the timing and the snap, so practise the shape until it lands cleanly, then practise lifting off it in rhythm. A good chop is felt before it is heard as harmony.
Building chords from notes, not just shapes
The tool’s rule is strict: every note in the diagram must belong to the chord, and the root must sound. That strictness teaches something useful. If you pick C major, you will never see an F or a G sharp in the diagram, because those notes are not in the chord. Check the note names under each course and you can see the chord’s anatomy: root, third, fifth, and any extension the chord type adds.
Use that to learn. Play the diagram, then name each note aloud from low to high. Then try the same chord in a different inversion by looking for a shape where the third or fifth sits on the lowest course. The tool gives one good fingering per chord; your ear and your hands can find the rest once you understand what it is made of.
Practice advice for clean chords
Press close to the fret wire, not in the middle of the fret, and use only as much pressure as the note needs. Buzzing usually comes from a finger sitting too far back or from a neighbouring course being touched by accident. Slow down, place one course at a time, and strum each course separately to find the culprit.
Start with major, minor, and dominant seventh shapes, which cover most folk, bluegrass, and country songs. Add major sevenths and minor sevenths next, then diminished and augmented shapes for passing chords. The mandolin rewards players who know a few shapes deeply far more than players who half-know fifty.
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