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The problem it solves
If the bass always plays the root, it leaps up and down and the line turns angular. Choosing inversions lets you move the bass smoothly, by step, without changing which chords sound.
Detailed theory
Key idea
Inversion = the bass plays a chord tone other than the root (3rd = first inversion, 5th = second).
The identity of the chord stays the same; what changes are the colour, the stability and the bass line.
Understand it
A chord can be played with any of its notes in the bass. If the root is at the very bottom, it is root position; if the third is, it is first inversion; if the fifth is, second inversion. They are always the same notes, only which one sits lowest changes.
Inverting does not turn the chord into a different one: C major stays C major whether the bass plays C or E. What changes is the weight and the colour, because the lowest note shapes how we perceive it.
The great practical advantage is bass voice-leading. Instead of leaping between roots (C-G-A), you can choose inversions so the bass moves by step and the low line sounds melodic and smooth.
Slash notation shows it: C/E means C major with E in the bass (first inversion). The part before the slash is the chord; the part after it, the note that goes in the bass.
An analogy: it is the same three people in a lift, but a different one stands at the front; the group is the same, only which face leads it changes.
Staff & keyboard
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Thanks to inversions, the bass can fall by step: C-B-A. A smooth, melodic bass line in bass clef, with no leaps.
How to recognise it
How it's written
Look at the lowest note of the chord: if it is not the root, the chord is inverted. In chord symbols, the slash tells you (C/E = C major with E in the bass).
How it feels
Play C in root position and then C/E: it is the same chord, but the second sounds a touch lighter and less grounded because the bass has risen to the third.
Common mistake
Believing an inversion is a different chord: C/E is the same C major, just with another note in the bass.
Reading C/E as if E were the chord: the chord is before the slash (C), the bass note after it (E).
Try it
Play C (bass C) and then C/E (bass E): same chord, bass higher up, lighter colour.
Chain C - G/B - Am and notice how the bass falls by step (C-B-A) instead of leaping.
On the instrument
Chord progression
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The same C major with two different basses: in root position (bass C) and in first inversion (C/E, bass E). Same notes, different colour and stability.
Where it's used
- Smoothing the bass line
- Choosing inversions so the bass moves by step instead of leaping between roots.
- Reading slash chords
- Interpreting slash symbols like C/E or G/B: the chord before the slash, the bass note after it.
Examples
Chord progression
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C - G/B - Am: the G/B inversion makes the bass fall smoothly C-B-A instead of leaping. Same chords, smoother bass line.
Mini test
Check that you've got it.
0/8 answeredQuestion 1/8
When do we say a chord is inverted?