The same chord progression can become block chords, repeated chords, broken chords, arpeggios, or a simple bass pattern.
Each section below is labeled with the target it teaches. The questions and your Noteflight task practice every target.
Communicator · Thinker — Thinking: balance musical layers so melody and accompaniment work together, not against each other.
Use what you're learning to complete the Noteflight task below, then check your own work before moving on.
Inquiry: How does the same chord progression sound different as block chords, repeated chords, or an arpeggio?
Reflect: What did “Ways to Accompany” teach you about your own composing choices?
An accompaniment pattern is a short figure that repeats, changing its notes whenever the chord changes. Every example in this lesson accompanies the same progression from Unit 5: I–IV–V–I in C. The chords never change; only the pattern does. That makes the comparison fair: any difference you hear comes from the pattern alone.
Each chord is struck once and held. Block chords are the calmest pattern: they supply harmony and almost no rhythm, which leaves the most room for an active melody. These chords use inversions (Chords: Part 2), so each one moves to the nearest notes of the next and the accompaniment stays in one register.
The same block chords, struck again on every beat. Repetition adds a steady pulse and forward drive without adding any new pitches. The faster the repetition, the more energy it creates: eighth notes sound more urgent than quarters.
The sparest accompaniment: just the bass line, playing the root of each chord and, here, its fifth. It grounds the harmony and marks the rhythm, but it leaves the middle of the texture empty, so the music sounds open and light.
A bass note on the strong beats (the “oom”) and a chord on the weak beats (the “pah”). The low–high alternation makes a strong, bouncing pulse. It is the backbone of marches, polkas, and ragtime, including Scott Joplin’s piano rags. In 3/4 it becomes oom-pah-pah, the pattern of the waltz.
In Unit 5 you unfolded a triad one pitch at a time as an arpeggio. As an accompaniment, the same idea becomes a pattern. To turn any chord into one: list its chord tones, choose an order, choose a rhythm, then repeat the pattern on the next chord with that chord’s tones. In this course, a pattern that sweeps up or down through the chord in order is an arpeggio; one that changes direction inside the chord is a broken chord.
Start with the block chord C–E–G. Play its tones low to high, add the root an octave up to complete the sweep, and give each note an eighth. Two sweeps fill a measure of 4/4. On IV the same pattern starts on F (F–A–C–F); on V it starts on G (G–B–D–G).
Applied to the whole progression, arpeggios keep the full harmony sounding while adding smooth, continuous motion. They fill the time a held chord would leave empty, which is why they suit flowing, lyrical melodies with long notes.
Named after the composer Domenico Alberti, this broken chord plays the tones low–high–middle–high: C–G–E–G. The top note repeats on every other eighth, so the pattern moves constantly without climbing into the melody’s space. Classical composers such as Haydn and Mozart used it constantly.
Bach’s Prelude in C spreads a C major chord across two octaves: C–E–G–C–E, then G–C–E again, all in sixteenth notes (four to a beat). Bach keeps this figure for nearly the whole prelude and changes only the chord each measure. There is no separate melody: the chord pattern is the music.
The accompaniment pattern shapes character more than almost any other choice, because it sets the rhythm a listener feels underneath the melody. Choose by asking two questions. What character do I want? And how active is my melody? A busy melody usually wants a simpler pattern; a melody with long notes can take a more active one. Below, the same melody gets two accompaniments.
Held block chords give the tune a calm, spacious, solemn character. Nothing moves underneath, so every change of chord is felt as an event, and the melody’s long notes ring out on their own.
Over oom-pah-pah, the same tune turns into a dance. The bass on beat 1 and chords on beats 2 and 3 make the strong–weak–weak pulse of 3/4 impossible to miss. Neither version is “right”: each creates a different character from the same melody and the same chords.
| Pattern | What it adds | Typical character |
|---|---|---|
| Block chords | Harmony, almost no rhythm | Calm, spacious, solemn |
| Repeated chords | A steady pulse | Driving, urgent (more so when faster) |
| Bass line alone | A foundation, little else | Sparse, open, light |
| Oom-pah | A strong–weak bounce | March, dance, playful |
| Arpeggio | Smooth, continuous motion | Flowing, lyrical |
| Alberti bass | Constant motion in a narrow space | Light, elegant, busy but gentle |
Here is the closed second phrase of “Ode to Joy” over an Alberti bass written for this course. Listen, then read how the pattern was built from the chords and why it suits this melody.
| Where | Chord and pattern | Why it works |
|---|---|---|
| m. 1 | I: C–G–E–G, twice | Steady eighths under the melody’s quarters; every pattern note is a tone of I |
| m. 2 | V: G–D–B–D, then I: C–G–E–G | Same shape, new chord tones; the chord changes halfway, as the melody descends |
| m. 3 | I: C–G–E–G, twice | Stays below G3, so the melody’s low point, C4, is still on top |
| m. 4 | V pattern, then a held I chord | The pattern stops as the melody lands on C, so the closed ending is clear |
Model description: The accompaniment is an Alberti bass: each chord’s tones in the order low–high–middle–high, in steady eighth notes. It follows the progression I | V–I | I | V–I, keeping the same shape and changing only the chord tones. Because the melody moves mostly in quarter notes, the eighth-note pattern keeps the music moving underneath without copying the melody’s rhythm, and it stays in a narrow, low register, so the melody is always on top. In the last measure the pattern gives way to a held I chord, which makes the closed ending sound final. The result is light and steady, a good fit for a simple, singable tune.
Notice what the description does: it names the pattern, explains how it was built from the chords, compares its rhythm and register with the melody’s, and says what character it creates.
Pick an answer for each question. You will see right away whether you are correct and why.
0 of 6 correct
1Which accompaniment pattern is this?
2Listen, then choose which excerpt you heard.
3This Alberti bass is meant to outline the V chord (G–B–D). Which note is not a chord tone?
4A composer has a slow, reflective melody made mostly of long held notes. Which accompaniment fits its character best?
5Listen only. What character does this accompaniment give the melody?
6Which description of the “Ode to Joy” worked example is most complete?
Hear what an accompaniment pattern does by keeping everything else identical. Write the same four chords three ways, then decide which version fits which character.
Add a second staff. Try the same four chords as block chords, repeated chords, and arpeggios. Compare the effect.
Each chord of I–IV–V–I held for a full measure.
The same chords, struck again in a steady rhythm.
Each chord unfolded one tone at a time, in order.
Decide which version fits a calm melody and which fits a lively one.
Play the three versions back to back. Describe what changes from one to the next: the pulse, the amount of motion, and how full the texture sounds.
Check every note of your arpeggios against its chord. Each one must be a chord tone of I, IV, or V.
Write 2–3 sentences modeled on the “Ode to Joy” description: choose the version that best fits a calm character and the one that best fits a lively character, and explain why.
Write Version 1 first, then copy its four measures and paste them after the originals to start Versions 2 and 3. The chords stay identical, and only the pattern changes.
0 of 6 checked
Finish the Noteflight work above, then mark this lesson done when you finish.