How do you create an interesting rhythm and a simple accompaniment to support a melody?
Create rhythmic patterns and a simple accompaniment for a melody, using broken chords, riffs or a bass line, and keeping the accompaniment supportive rather than competing
A clear, step-by-step answer to the N(A)-Level Music composing outcome on accompaniment. Creating rhythmic patterns and ostinatos, building a simple accompaniment from broken chords, a bass line or a riff, and keeping it supportive of the melody.
Reviewed by: AI editorial process; not yet individually human-reviewed
Have a quick question? Jump to the Q&A page
Jump to a section
What this dot point is asking
SEAB wants you to create an interesting rhythm and a simple accompaniment to support a melody, using ideas such as broken chords, a bass line or a riff, while keeping the accompaniment supportive rather than competing with the tune. The big idea is that once you have a melody and its chords, you can turn those chords into an accompanying part in several ways, and the skill is to make it interesting but still in the background.
The answer
Turning chords into an accompaniment
If you have a melody with chords underneath, you can play those chords in different ways to make an accompaniment:
- Block chords: play all the notes of each chord together, on the beat or once per bar. Simple and steady.
- Broken chords (arpeggios): play the chord notes one after another in a pattern (low, middle, top, middle), spreading the chord out in time. This adds flow.
- Bass line: play the root notes of the chords low down, giving a foundation and drive.
- Riff or ostinato: a short, catchy pattern repeated over and over.
Creating rhythmic patterns
A good accompaniment has its own rhythmic pattern, a steady, repeating figure that drives the music. An ostinato is a short pattern (rhythmic or melodic) repeated throughout a section. Using a clear pattern, rather than random notes, gives the accompaniment a groove and makes it easy to follow.
Keeping it supportive, not competing
The accompaniment must support the melody, not fight it. Keep it simpler and usually lower in pitch than the tune, at a softer dynamic, and avoid making it too busy or copying the melody exactly. Leaving some space lets the melody stay the main focus.
Matching the style
Choose an accompaniment that suits the style of the piece: gentle broken chords for a calm song, a driving bass-and-riff for an upbeat one, steady block chords for a hymn-like feel. The accompaniment helps set the mood as well as the harmony.
Examples in context
Example 1. A song with a guitar arpeggio. A gentle song often has a guitar playing broken chords (arpeggios) under the voice, providing harmony and flow while staying quietly in the background. It is a clear model of a supportive broken-chord accompaniment.
Example 2. A dance track with a bass riff. An upbeat dance number is often driven by a short, repeated bass riff (an ostinato) under the melody, giving energy and groove. It shows how a simple repeated pattern can power a whole piece.
Try this
Q1. Name three ways to turn chords into an accompaniment. [2 marks]
- Cue. Any three of: block chords, broken chords (arpeggios), a bass line on the chord roots, and a repeated riff or ostinato.
Q2. Define an ostinato. [2 marks]
- Cue. An ostinato is a short musical pattern (rhythmic, melodic, or both) that is repeated over and over throughout a section to give a steady drive.
Q3. State two ways to make sure an accompaniment supports rather than competes with the melody. [3 marks]
- Cue. Any two of: keep it simpler and less busy than the tune; keep it generally lower in pitch and softer; leave space; and do not copy the melody exactly, so the tune stays the main focus.
Exam-style practice questions
Practice questions written in the style of SEAB exam questions on this dot point, with worked answer explainers. The year tag is the paper they imitate, not the source.
Original8 marksYou have written a melody with simple chords (I, IV, V) underneath. Describe in words three different ways you could turn those chords into an accompaniment, and explain how you would keep the accompaniment from competing with the melody.Show worked answer →
Block chords. The simplest accompaniment plays each chord as a block (all notes together) on the beat, for example one chord per bar or on each strong beat. This is clear and steady.
Broken chords. Instead of playing the chord notes together, play them one after another in a pattern (an arpeggio or broken chord), for example low note, middle, top, middle, repeating. This adds movement and flow while still outlining the same chords.
Bass line or riff. Play a bass line using the root notes of the chords (or a short repeated pattern, a riff or ostinato) to drive the music along underneath the tune.
Keeping it supportive: keep the accompaniment simpler and usually lower than the melody, do not make it too busy or too high, and leave the melody as the main focus, so the accompaniment supports rather than competes.
What markers reward: three genuine accompaniment styles (block chords, broken chords or arpeggios, bass line or riff), each based on the same chords, and a clear strategy for keeping the accompaniment supportive (simpler, lower, not too busy). The strongest answers stress that the melody must stay the main focus.
Original6 marks(a) Define an ostinato. (b) Explain how a broken chord (arpeggio) accompaniment is made from a chord. (c) State two ways to make sure an accompaniment supports rather than competes with the melody.Show worked answer →
(a) An ostinato is a short musical pattern (rhythmic, melodic, or both) that is repeated over and over throughout a section, providing a steady, driving foundation.
(b) A broken chord (arpeggio) accompaniment takes the notes of a chord and plays them one after another instead of all together, often in a repeating up-and-down or rocking pattern, so the chord is spread out in time while still outlining the same harmony.
(c) Two ways: keep the accompaniment simpler and less busy than the melody; keep it generally lower in pitch (out of the melody's way) and at a softer dynamic, so the tune stays on top as the main focus. Leaving space and not doubling the melody also count.
What markers reward: a clear definition of ostinato as a repeated pattern, a correct account of broken chords as chord notes played in sequence, and two sensible ways to keep the accompaniment supportive (simpler, lower, softer, less busy). A strong answer notes the melody should remain the focus.
Related dot points
- Write a simple melody in a chosen key with a clear shape, balanced question-and-answer phrases, mostly stepwise movement, and a satisfying ending on the tonic
A clear, step-by-step answer to the N(A)-Level Music composing outcome on melody. Choosing a key and range, building balanced question-and-answer phrases, mixing steps and leaps, using repetition, and ending on the tonic.
- Harmonise a simple melody using the primary chords (I, IV, V), match chords to the melody notes, change chords at a sensible rate, and place a cadence at the phrase end
A clear, step-by-step answer to the N(A)-Level Music composing outcome on harmonising a tune. Using the primary chords I, IV and V, matching a chord to each melody note, choosing a sensible harmonic rhythm, and placing a perfect cadence at the end.
- Plan a short composition from a brief, choosing a structure (such as ABA or verse-chorus), developing a main idea, creating contrast, and shaping a clear beginning, middle and end
A clear, step-by-step answer to the N(A)-Level Music composing outcome on structuring a piece. Reading a brief, choosing a simple structure such as ABA or verse-chorus, developing one main idea, adding contrast, and giving the piece a clear beginning, middle and end.
- Describe the rhythm section of a pop or rock band (drums, bass, guitar or keyboard), explain each instrument's role, and explain how they lock together to create a groove
A clear answer to the N(A)-Level Music outcome on the rhythm section. The roles of drums, bass and chordal instruments, how the drum kit lays down the beat, how bass and drums lock together, and what makes a groove.
- Explain beat, metre and tempo, count simple time signatures, identify common note groupings, and describe whether music feels in twos, threes or fours
A clear answer to the N(A)-Level Music outcome on rhythm. Beat and metre, counting 2/4, 3/4 and 4/4, strong and weak beats, simple note groupings and ties, and describing tempo from slow to fast with the right words.