Root position, first inversion and second inversion are the three positions of a triad, named by the note in the bass. In root position the root is lowest, in first inversion the 3rd is lowest, and in second inversion the 5th is lowest. For C major that is C–E–G, E–G–C and G–C–E.
What are root position, first inversion and second inversion?
The three positions of a triad are named by which note sits in the bass, the lowest note of the chord. Root position puts the root in the bass, first inversion puts the 3rd in the bass, and second inversion puts the 5th in the bass. For C major, root position is C, E, G; first inversion is E, G, C; and second inversion is G, C, E. The notes are the same in all three, so the chord is the same chord, but each position sounds different, because the bass note is the note the ear hears as the foundation of the chord. Each position has a distinct character and a distinct job. Root position is the most stable and the most final, which is why phrases usually end on a root-position chord. First inversion is lighter and more mobile, and it is the workhorse of smooth bass lines, because it lets the bass move by step. Second inversion is the least stable of the three, and it is mostly used as a passing chord, a cadential chord before the dominant, or a pedal point, rather than as a chord in its own right. Knowing which position to use, and when, is a core skill in arranging and in playing piano or guitar accompaniment.
How the three positions compare
Compare them side by side in the same key and the differences are clear. Take G major: G, B and D. Root position is G, B, D, with G in the bass, and it sounds solid and grounded. First inversion is B, D, G, with B in the bass, and it sounds lighter, almost as if the chord is leaning forward. Second inversion is D, G, B, with D in the bass, and it sounds open and unresolved, as if it is waiting for something. The same comparison works for minor chords: A minor in root position is A, C, E; in first inversion it is C, E, A; in second inversion it is E, A, C. Classical theory gives each position a figured-bass label based on the intervals above the bass note. Root position is 5/3, because the notes above the bass are a 3rd and a 5th. First inversion is 6/3, shortened to 6, because the notes above the bass are a 3rd and a 6th. Second inversion is 6/4, because the notes above the bass are a 4th and a 6th. You do not need to use these numbers in everyday playing, but they explain why chord symbols sometimes look cryptic in classical scores. The G major piano chord shows the three positions on piano, and the chord inverter lists them for any chord.
Worked example — D major in all three positions. D major is D, F# and A. Root position is D, F#, A, with D in the bass. First inversion is F#, A, D, with F# in the bass. Second inversion is A, D, F#, with A in the bass. Now use them in a bass line: play D in root position, then G in first inversion (B, D, G, with B in the bass), then A in root position. The bass moves D, B, A, a smooth stepwise descent, instead of leaping D, G, A. The D major guitar chord is the root-position shape on guitar, and the key of D major shows where the chord belongs.
How to practise the three positions
Learn the positions as a set, not one at a time, so your hand knows all three before you need them in a song.
- On piano, play the C major triad in all three positions with your right hand, keeping your hand in the same octave and moving only the fingers that need to move.
- Play a I–V–I movement in C major using root position C, first inversion G (B, D, G) and root position C, and listen for the bass stepping C, B, C.
- On guitar, find the G major guitar chord triad on the top three strings in all three positions, moving the same three notes across string sets.
- Play the I–vi–IV–V progression in G major on piano using the inversion that keeps your right hand closest to the previous chord.
- Use the chord inverter to check the bass note of every inversion you practise, so you can name the position without guessing.
Common mistakes
- Doubling the wrong note in first inversion — In first inversion, doubling the 3rd, which is in the bass, makes the chord sound top-heavy. Double the root or the 5th instead, and keep the bass note single.
- Using second inversion as a stable chord — Second inversion is unstable because the 5th is in the bass, a 4th above the root. It works as a passing chord or a cadential chord, but not as a resting place, so do not end a phrase on it.
- Forgetting the bass note when naming a chord — A chord's position is decided by its lowest note, not by the order of the notes above it. E, G, C is first inversion even if the C is on top, because the E is the lowest note.
Quick reference
This table works out the three positions of the G major triad, so you can compare them directly with the C major example and see that the pattern is identical on every root. The notes are G, B and D in all three rows, and only the bass note changes, from G in root position to B in first inversion to D in second inversion.
| Position | Notes (G major) | Bass note |
|---|---|---|
| Root position | G – B – D | G |
| First inversion | B – D – G | B |
| Second inversion | D – G – B | D |
Use the table to build a smooth bass line: play G in root position, then C in first inversion with E in the bass, then D in root position, and listen for the bass stepping G, E, D instead of leaping. That stepwise bass line is the reason inversions exist, and it is the skill that turns chord shapes into real accompaniment.
Frequently asked questions
What is root position?
Root position is the chord with its root as the lowest note. For C major that is C, E, G with C in the bass. It is the most stable position and the one most phrases end on.
What is first inversion?
First inversion is the chord with its 3rd as the lowest note. For C major that is E, G, C with E in the bass. It sounds lighter than root position and is used to create smooth, stepwise bass lines.
What is second inversion?
Second inversion is the chord with its 5th as the lowest note. For C major that is G, C, E with G in the bass. It is the least stable position and is mostly used as a passing chord or before a cadence.
How do I know which inversion I am playing?
Look at the lowest note. If the lowest note is the root, it is root position; if it is the 3rd, first inversion; if it is the 5th, second inversion. The notes above the bass do not change the answer.
Can a 7th chord have a third inversion?
Yes. A 7th chord has four notes, so it has four positions: root position, first inversion (3rd in the bass), second inversion (5th in the bass) and third inversion (7th in the bass). A G7 chord in third inversion is F, G, B, D, with F in the bass.