A chord inversion happens when the same chord tones are kept, but a different note is placed in the bass. This matters because the bass note strongly affects how a chord feels, connects, and moves in music. In a C major triad, the notes are always C, E, and G, but the chord can sound more settled or more active depending on whether C, E, or G is lowest.
Inversions help composers and performers create smoother motion between chords without changing the chord’s basic identity.
Think of a chord like a small stack of notes that can be rearranged. Root position places the root on the bottom, first inversion places the third on the bottom, and second inversion places the fifth on the bottom. On a piano, this often means moving the lowest note up an octave or choosing a new spacing that keeps the same chord tones.
On a staff, inversions are identified by the lowest sounding note, not by the left-to-right order of note names.
Key Facts
- C major triad = C + E + G.
- Root position: root is in the bass, so C major is C-E-G with C lowest.
- First inversion: third is in the bass, so C major is E-G-C with E lowest.
- Second inversion: fifth is in the bass, so C major is G-C-E with G lowest.
- Triad inversion symbols: root position = 5/3, first inversion = 6/3 or 6, second inversion = 6/4.
- An inversion changes the bass note and spacing, but not the chord quality or chord name.
Vocabulary
- Chord
- A chord is a group of notes sounded together, usually built from stacked intervals such as thirds.
- Triad
- A triad is a three-note chord made of a root, a third, and a fifth.
- Root
- The root is the note that gives a chord its name and acts as its main reference point.
- Bass note
- The bass note is the lowest sounding note in a chord, regardless of the chord’s name.
- Inversion
- An inversion is a rearrangement of a chord in which a chord tone other than the root is placed in the bass.
Common Mistakes to Avoid
- Calling every C-E-G arrangement root position is wrong because inversion depends on the lowest note, not only on which notes are present.
- Changing one chord tone and still calling it the same inversion is wrong because inversions keep the same notes as the original chord.
- Using the highest note to name the inversion is wrong because inversion is determined by the bass note.
- Thinking first inversion means the notes must appear exactly E-G-C is wrong because any spacing with E as the lowest note is still first inversion.
Practice Questions
- 1 Write the three inversions of a C major triad using note names, starting with root position, then first inversion, then second inversion.
- 2 A triad has the notes F, A, and C. If A is the lowest note, which inversion is it, and what is the chord name?
- 3 A passage moves from C major in root position to F major in first inversion. Explain why using an inversion might make the bass line smoother than using only root-position chords.