Filling parts
Filling parts are voices that are not led melodically in their own right but only complete the harmony. Mostly they are the inner voices of a texture: the melody lies on top, the bass at the bottom, and in between they fill out the chord.
- Meaning
- inner voices that supply chord tones
- Typical
- small steps, often held or repeated notes
- Counterpart
- outer voices (melody and bass) that carry the texture
- Found in
- choral writing, piano writing, orchestra
Melody, bass and what lies in between
A four-part texture has four voices, but listeners follow mainly two: the upper line, which stands out as the melody, and the lowest, which lays the floor. The two voices in between are mostly filling parts. Their job is to make the chord complete, so to supply the third and the fifth that melody and bass do not happen to carry.
Four-part texture: C – F – G – C
On top the melody (E–F–D–C), at the bottom the bass (C–F–G–C). The two inner voices fill out the chords: the lower stays almost on C (C–C–B–C), the upper moves in small steps (G–A–G) and at the end a third (E). They are not melody themselves, but without them the chords would lack third and fifth. Only in the final chord is there another C instead of the fifth, so the root sounds three times.
How to recognise filling parts
In the example the lower inner voice moves from C to C, then to B and back to C. That is one resting point and two semitone steps. The upper inner voice makes steps of a second and only at the end a small leap. This restraint is typical: filling parts are not to compete for attention but to stay in the background. If they made large leaps, the ear would wander to them, and the melody would be lost.
The teaching of voice leading puts it like this: inner voices are led as far as possible with common notes and steps. The result is a calm texture in which the triads are complete. The final chord of the example makes an exception: it has a repeated root instead of the fifth (C–C–E–C, so three times C). Harmony teaching allows that at the close when the chord before was complete.
Filling parts beyond choral writing
The term does not apply only to choirs. In piano writing too the inner voices often take on the job, and in the orchestra it is often violas and horns that play held or repeated chord tones. Whether a voice is a filling part is decided not by its register but by its role in the texture. A bass that merely repeats chord tones is not a filling part but foundation.
Common mistakes
- Treating filling parts as unimportant: they decide whether a chord sounds complete.
- Letting inner voices leap: large leaps draw attention away from the melody.
- Equating filling part with accompaniment: filling parts belong to the many-voiced texture, accompaniment can also be a pattern, such as broken chords.
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Related terms
ChordTriadAccompanimentCounterpointHomophonyDiatonic chordProgressionDoubling
Editor: Maik Krohm · reviewed on 3 October 2026
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