Chords in the key of G major

The key has one sharp, F#, and its scale is G A B C D E F#. Building a triad on each degree gives the chords of the key:

I — G major (G B D). Home. Every progression in the key resolves here.

ii — A minor (A C E). The usual approach to D, and half of the ii–V pair.

iii — B minor (B D F#). The least used of the six, and the only shape that needs a barre on guitar.

IV — C major (C E G). The other pillar beside G and D.

V — D major (D F# A). The chord that pulls hardest back to G, especially as D7.

vi — E minor (E G B). The relative minor, sharing all seven notes with G major.

vii° — F# diminished (F# A C). Unstable and rare in songs; in practice it is replaced by D7, which contains the same tension.

Musicians name these by Roman numeral rather than by letter, because the numbers stay the same in every key. G–C–D is I–IV–V here and A–D–E in the key of A — the same progression moved.

G–C–D (I–IV–V). The three-chord backbone of folk, country and early rock. Add a seventh to the D and the pull home gets stronger.

G–Em–C–D (I–vi–IV–V). The fifties progression: doo-wop, ballads, and a very large share of everything written before 1965.

G–D–Em–C (I–V–vi–IV). The four-chord pattern behind an enormous number of modern pop songs. Play it as a loop and you will recognise several at once.

Em–C–G–D (vi–IV–I–V). The same four chords starting on the minor. Same harmony, quite different feeling — it begins in shadow and arrives at light.

G–Bm–C–D (I–iii–IV–V). Uses the neglected third degree; the Bm between G and C makes the climb to D feel gradual rather than sudden.

Am–D–G (ii–V–I). The cadence of jazz standards, and the reason A minor matters more than its plain sound suggests.

G major is the guitarist's key. G, C, D, Em and Am are all open chords — the first five most beginners learn — and only Bm needs a barre.

That single fact explains a great deal of popular music. Songs get written in the key the guitar makes easy, and G is easier than almost anything else. Where a song sits in G but the voice does not, a capo moves the shapes without changing them: capo 2 with G shapes sounds in A, capo 4 sounds in B.

Two things worth knowing at the instrument. The open G string and open D string ring inside most of these chords, so the key sounds fuller than the same progression played in F. And Bm can be avoided almost always — substitute D/F# or simply leave it out, and few listeners notice.

For a fuller sound, Gsus4 to G and Dsus4 to D are the standard decorations: a single finger moves, and the chord seems to breathe.

At the keyboard the key of G has one black note in the scale, F#, and that makes it the second-easiest major key to read and play after C.

The chords fall comfortably under the hand: G, C and D are all white-key triads except for the F# inside D major. Left hand takes the root, right hand takes the triad, and inversions keep the movement small — from G to C, hold the G and move the other two notes up a step each, which is voice leading applied without thinking about it.

A common keyboard arrangement in this key puts the bass on the root and the right hand a tenth above, leaving the middle register empty for a singer. That is why so many worship and singer-songwriter charts are written in G rather than in C.

For a wider sound, add the ninth: Gadd9 and Dadd9 are the two chords that make an ordinary progression in this key sound modern.

Adding a seventh to each degree gives Gmaj7, Am7, Bm7, Cmaj7, D7, Em7 and F#m7♭5. In jazz and soul these are the normal forms rather than decorations, and the ii–V–I becomes Am7–D7–Gmaj7.

D7 is the important one. It is the only seventh in the key that is dominant, and it is what makes the return to G feel inevitable.

Outside the seven, three borrowed chords appear constantly. E major instead of Em turns the sixth degree into a secondary dominant pulling to Am. A major instead of Am pulls to D. B♭ major, borrowed from G minor, gives the flat-seventh sound of countless rock riffs.

None of these break the key. They lean out of it briefly and come back, which is most of what makes harmony interesting after the first three chords.

Three reasons stack up. The guitar makes it easy. The vocal range suits most untrained singers — the tonic sits low enough to speak and high enough to belt. And its relative minor, E minor, is equally comfortable, so a song can move between bright and dark without leaving open position.

The same logic explains the neighbours. C, D and A are the other guitar-friendly keys, and between the four of them they hold most of the popular repertoire.

If a song written in G does not fit your voice, do not rewrite it — move it. A capo keeps the shapes and the sound; transposing keeps the sound and changes the shapes. Either way the numbers stay I–IV–V.

The same seven chords read as numbers work in every key — see the key of C major for the other side of that, and transposition for moving a song between them. The relative minor of G is E minor, covered with the other minor keys.