Appendix 3: Musical vocabulary - Sonority and texture — Edexcel GCSE Music

Sonority is the term for how a sound actually comes across: its nature (what kind of sound it is, such as a bowed string, a plucked string, a struck metal bar or a breath-driven pipe) and its quality (the colour or character of that sound, such as bright, dark, warm, nasal, reedy or mellow). The same pitch played on a violin, a flute and a trumpet has the same frequency but a different sonority because each instrument reinforces different overtones. In listening questions you identify the nature of the sound (which instrument, voice or combination is producing it) and describe its quality using precise vocabulary rather than vague words like 'nice'. Notice changes of sonority too: a muted trumpet, a change from arco to pizzicato, a singer moving from chest to head voice, or a section switching from strings to woodwind.

Articulation describes how much one note is separated from the next. At one end is legato, where the separation is minimal and notes are played smoothly and connected. Moving along the scale you meet non-legato or detached playing, then staccato, where each note is shortened and clearly separated, and finally staccatissimo, where the separation is greatest and notes are very short and crisp. Articulation can be produced by bowing (smooth bow versus short stopped bow), tonguing on a wind instrument, finger release on a keyboard, or consonants in singing. In listening questions you judge the degree of separation you hear and choose the matching term, and you may also be asked how a performer achieves it.

Sonority, or tone colour, is the particular quality of sound that lets you tell one instrument or voice from another, even when both play the same pitch and dynamic. It comes from the way the sound is produced and from the blend of overtones: a flute sounds airy and pure, a trumpet bright and penetrating, a cello warm and rich. The same instrument can change its tone colour through technique, such as muted strings, pizzicato, or a singer switching between chest and head voice. When answering, name the instrument or voice and describe the quality of its sound, then explain how that colour is produced or changed.

Texture describes how many parts sound at once and how those parts relate. Count the parts first: a single unaccompanied line is one part (monophonic); a melody with chordal accompaniment has several parts moving together (homophonic); independent interweaving lines that imitate or copy one another give polyphonic or contrapuntal texture. Listen for whether parts move in the same rhythm (chordal, homophonic) or at different times (imitative, polyphonic), and whether one line dominates. A round such as 'Frère Jacques' is a clear example: each voice enters in turn with the same tune, so the parts relate by imitation. When answering, name the texture and justify it by describing the number of parts and their relationship, not just by labelling it.

This vocabulary item describes the relationship between a principal part and the musical background that supports it. A principal part carries the melody or the main musical interest; the background supplies harmony, rhythm, pulse or atmosphere beneath or around it. The classic example is a piano accompanying a solo singer: the voice presents the tune and the words, while the piano provides chords, an accompaniment figure and harmonic support. The same idea applies to a solo violin over an orchestra, a flute over a string accompaniment, or a guitar behind a vocal line. When you listen, identify which part is foregrounded and which parts are subordinate, then describe how the background supports the principal part through harmony, texture, dynamics and rhythm.

This item defines the basso continuo, the bass line underpinning much Baroque orchestral, choral and chamber music. It is usually played by low string instruments such as cello or double bass, sometimes with bassoons, giving a sustained bass line. Above or alongside this, a chord-playing instrument — most notably harpsichord, organ or lute — completes the harmony by realising the figured bass, reading the figures to add chords. Together the low strings and the chord-playing instrument form the continuo group. When you listen, identify the low sustained bass and the chordal filling above it, and recognise that the figures are a shorthand for harmony rather than a written-out part.

Heterophony is a texture in which two or more parts perform the same melodic line at the same time, yet each part decorates or alters it slightly, so the versions are recognisably the same tune but not identical. The shared melodic identity is what separates heterophony from polyphony, where independent lines combine, and from homophony, where one melody is supported by subsidiary accompanying parts. A useful test is to ask whether all the parts are trying to present one tune: if yes, and the differences are small ornamental variants, the texture is heterophonic. Listen for simultaneous versions of a melody where one player adds grace notes, ornaments or slight rhythmic displacement while another keeps the plain line. The adjective describing this texture is ‘heterophonic’.

Homophony is one of the most common textures in Western music: a single melody part is supported by other subsidiary parts that accompany it. The melody is the focus of attention, while the accompanying parts provide harmony, rhythm or backing rather than competing tunes. A practical test is to ask whether one part clearly carries the tune while the others support it: if so, the texture is homophonic. This differs from heterophony, where several parts present variants of the same melody, and from polyphony, where independent melodic lines combine. The adjective describing this texture is ‘homophonic’. Recognising the melody-and-accompaniment relationship is the key skill, whether reading a score or listening to an extract.

Monophonic texture means exactly one note sounds at any given moment, so the ear follows a single melodic line with no harmony or accompanying part beneath or beside it. A lone unaccompanied melody, such as a solo voice singing a folk song or a flute playing a tune alone, is monophonic. The key test is simultaneity: if a second pitch sounds at the same instant, the texture is no longer monophonic. Be careful with two ideas. First, several instruments or voices may play the same line in unison or at the octave and the texture stays monophonic, because only one distinct pitch class is heard at a time. Second, a melody with chordal accompaniment is not monophonic, even if the tune dominates. The adjective is ‘monophonic’; the noun is ‘monophony’. Contrast it with polyphonic (independent simultaneous lines) and homophonic (a melody with chordal support).

Polyphonic texture has two or more parts sounding together. In its broad sense, any music with two or more simultaneous parts counts as polyphonic. In its common, narrower sense it is a synonym for counterpoint: two or more melody lines that are simultaneous and largely independent, each with its own shape and movement, as in a fugue or a round. The test is independence: if the parts move as largely separate melodic lines, the texture is polyphonic; if one melody is supported by block chords, it is homophonic. The adjective is ‘polyphonic’; the noun is ‘polyphony’. Note the two senses carefully, because a question may use the broad meaning (any multi-part texture) or the narrower contrapuntal meaning. Always justify your label by describing what the parts do.

A ‘part’ is a single melodic line, so counting parts means counting independent lines, not counting instruments or players. Two-part music therefore has two melodic lines running together, and because both lines sound at once you normally hear two notes together; the exception is where one line or both lines rest, when the texture thins to one note or to silence. The same logic extends: three-part music has three melodic lines and four-part music has four. A useful method is to trace each line horizontally across a short passage and count how many lines are active at each moment. If two players double the same line at the octave, that is still one part, not two.

This describes imitative texture. Two or more parts present the same melodic idea, but the sharing need not be complete, exact or at the same pitch: a part may quote only a fragment, vary the rhythm or interval, or enter at a different octave. The defining feature is the staggered entry: each new part comes in separately rather than all at once, while the part already sounding carries on, either continuing the shared idea or moving to new material. A practical method is to listen for the first entry, then note where the second part joins and whether it echoes the opening idea. If all parts begin together with the same tune, that is homophonic or unison writing, not this imitative process.