---
title: "Stepwise Motion — AP Music Theory Definition & Exam Guide"
description: "Stepwise motion is movement between adjacent scale degrees. It's the backbone of 18th-century voice leading in Unit 4, from soprano lines to chordal seventh resolutions."
canonical: "https://fiveable.me/ap-music-theory/key-terms/stepwise-motion"
type: "key-term"
subject: "AP Music Theory"
unit: "Unit 4"
---

# Stepwise Motion — AP Music Theory Definition & Exam Guide

## Definition

Stepwise motion (also called conjunct motion) is melodic movement between adjacent scale degrees, moving by half or whole step. In AP Music Theory, it's the default motion for upper voices in 18th-century voice leading and the standard way tendency tones like the chordal seventh resolve.

## What It Is

Stepwise motion means a voice moves to the very next [scale degree](/ap-music-theory/key-terms/scale-degree "fv-autolink"), up or down, by a half step or whole step. No skipping. If a [melody](/ap-music-theory/unit-2/melodic-transposition/study-guide/37yjbA6PqIr71IzgG9iY "fv-autolink") goes C-D-E-F, that's pure stepwise motion. The opposite is a **leap** (disjunct motion), where the voice jumps a third or more.

In the 18th-century style the AP exam emulates, stepwise motion is what makes [voice leading](/ap-music-theory/unit-5/cadential-64-chords/study-guide/Fmolx6ik4nmpMVO4inHe "fv-autolink") sound smooth. The CED's voice-leading rules (PIT-4.A.1) say each part should achieve "linear smoothness," and stepwise motion is how you get there. It's also baked into how tendency tones behave. A chordal seventh resolves *down by step*, and the leading tone resolves *up by step* to tonic. Upper voices (soprano, alto, tenor) move mostly by step, while the bass is allowed to leap more often. When you write a part-writing FRQ, the smoothest answer between any two chords is usually the one where each voice moves by step or stays put.

## Why It Matters

Stepwise motion lives in [Unit 4](/ap-music-theory/unit-4 "fv-autolink") (Harmony and Voice Leading I) and supports the core part-writing objectives. Under [AP Music Theory](/ap-music-theory "fv-autolink") 4.1.A, you apply 18th-century voice-leading procedures through analysis, error detection, writing, and listening, and "linear smoothness" is the explicit standard. Under 4.1.E, when you compose a bass line below a given soprano, the CED tells you upper voices "tend toward more stepwise motion" while the bass leaps more freely (PIT-3.D.2). Then Topic 4.5 takes it further. Inverted seventh chords exist largely *because* they let the bass move stepwise (PIT-4.A.10), and leading-tone seventh chords placed between tonic chords prolong tonic "in stepwise voice leading" (PIT-4.A.11). In short, stepwise motion isn't just a melody-writing tip. It's the logic behind why composers choose specific inversions, and the exam tests whether you understand that logic.

## Connections

### Voice Leading (Unit 4)

Voice leading is the big system; stepwise motion is its favorite move. The CED's goal of "linear smoothness" basically means "move by [step](/ap-music-theory/unit-4/voice-leading-with-seventh-chords/study-guide/XpRYmaLewSzb1mJjUNZX "fv-autolink") whenever you can." When you check a part-writing exercise for errors, voices making unnecessary leaps are a red flag.

### [Chordal Seventh (Unit 4)](/ap-music-theory/key-terms/chordal-seventh)

The [chordal seventh](/ap-music-theory/key-terms/chordal-seventh "fv-autolink") is the classic tendency tone, and its resolution is mandatory stepwise motion downward. If the seventh of a V7 leaps away instead of stepping down, that's a voice-leading error the exam expects you to catch.

### [Leap (Unit 4)](/ap-music-theory/key-terms/leap)

[Leap](/ap-music-theory/key-terms/leap "fv-autolink") is the direct opposite of stepwise motion. The CED gives the bass line a license to leap (thirds, fourths, fifths, sixths, octaves) that upper voices don't get. Knowing which voice gets which kind of motion is half the battle in bass-line composition.

### [Chord Progression (Unit 4)](/ap-music-theory/key-terms/chord-progression)

Stepwise motion shapes which inversions a progression uses. Seventh chords in inversion connect chords specifically so the bass can move melodically by step (PIT-4.A.10). A V43 between two tonic chords exists to give the bass a smooth scale-step path.

## On the AP Exam

Stepwise motion shows up everywhere in Unit 4 tasks. Multiple-choice questions ask things like what voice leading should avoid in melodic motion, how often the bass leaps compared to upper voices, and how inverted leading-tone seventh chords between tonic chords keep the voice leading stepwise. On the part-writing FRQs, you apply it directly. When you compose a bass line for a given soprano, you balance steps and leaps (the bass leaps more, but steps still matter). When you realize figured bass or Roman numerals, you resolve the chordal seventh down by step and the leading tone up by step. One special case worth memorizing for Topic 4.5 is the V43 chord, whose seventh can break the usual rule and resolve upward by step when the bass is moving stepwise from 1 to 3. Graders reward smooth, mostly-stepwise upper voices, so when in doubt, take the step.

## Stepwise Motion vs Leap (disjunct motion)

Stepwise (conjunct) motion moves to an adjacent scale degree, a second up or down. A leap (disjunct motion) is any interval of a third or larger. The confusion isn't usually about definitions, it's about *when each is allowed*. Upper voices should favor steps; the bass line can leap freely (thirds, fourths, fifths, sixths, octaves) as long as octave leaps change direction and successive same-direction leaps outline a triad. A melodic third in the soprano isn't an error, but a soprano line full of leaps fails the smoothness standard.

## Key Takeaways

- Stepwise (conjunct) motion means moving to the next scale degree by half or whole step, while anything a third or larger is a leap.
- Upper voices in 18th-century style favor stepwise motion, while the bass line uses leaps with greater frequency (PIT-3.D.2).
- Tendency tones resolve by step: the chordal seventh steps down, and the leading tone steps up to tonic.
- Inverted seventh chords (Topic 4.5) are often chosen specifically so the bass can move with a melodic, stepwise quality.
- Leading-tone seventh chords (vii°7) placed between two tonic chords prolong the tonic through stepwise voice leading.
- In part-writing FRQs, the smoothest voice leading between two chords usually keeps common tones and moves everything else by step.

## FAQs

### What is stepwise motion in music theory?

Stepwise motion (conjunct motion) is melodic movement between adjacent scale degrees, by half step or whole step. In AP Music Theory, it's the preferred motion for upper voices in 18th-century voice leading and the required resolution for tendency tones.

### Is a third stepwise motion?

No. A third is a leap (disjunct motion). Only seconds, meaning half steps and whole steps between adjacent scale degrees, count as stepwise motion. Thirds are small, common leaps but they're still leaps.

### Does the bass line have to move stepwise in AP part-writing?

No. The CED explicitly says the bass leaps more often than upper voices, allowing thirds, fourths, fifths, sixths, octaves, and properly resolved descending diminished fifths. Octave leaps must change direction afterward, and successive same-direction leaps should outline a triad.

### How is stepwise motion different from parallel motion?

Stepwise motion describes one voice's melodic interval (a second). Parallel motion describes the relationship between two voices moving in the same direction by the same interval. Two voices can move stepwise in parallel, contrary, or oblique relationships, so the terms answer different questions.

### Why do inverted seventh chords matter for stepwise motion?

Inversions let the bass take a smooth, stepwise path instead of jumping between roots. Per the CED (PIT-4.A.10), seventh chords in inversion connect chords in a progression so the bass has a melodic stepwise quality, like vii°6/5 or V4/3 filling the space between tonic chords.

## Related Study Guides

- [4.1 Harmony and Voice Leading I](/ap-music-theory/unit-4/harmony-voice-leading-i/study-guide/0m8OiGeqjebWSd6bMZ0W)
- [7.4 Part Writing of Secondary Leading Tone Chords](/ap-music-theory/unit-7/part-writing-secondary-leading-tone-chords/study-guide/O6JJhIjRs0qB7IZEgQ0t)
- [4.5 Voice Leading with Seventh Chords in Inversions](/ap-music-theory/unit-4/voice-leading-with-seventh-chords-inversions/study-guide/dIhXWfvKiWKh2bRfTjyE)

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