How do scales, intervals and chords organise pitch, and how do you identify them by ear and on the page?
Pitch in depth: scales (major, minor, modal, pentatonic, blues), intervals, triads and seventh chords, and basic harmonic progressions used in tonal and popular music
A focused answer to the HSC Music pitch dot point. Major and minor scales, modes, pentatonic and blues scales, how to identify intervals, building triads and seventh chords, and the common harmonic progressions you must recognise by ear and analyse in scores.
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What this dot point is asking
Pitch carries the heaviest technical theory in HSC Music. You are expected to know how scales are built, how to identify intervals, how triads and seventh chords are formed, and how chords combine into progressions. Music 1 students mostly need this for aural identification and to support composition and performance. Music 2 students must also read and write this material in notation and apply it in score analysis. This dot point asks you to handle pitch with precision rather than vague description.
The answer
Scales
A scale is an ordered set of pitches. The major scale follows the tone pattern T T S T T T S (for example C major: C D E F G A B C). The natural minor uses T S T T S T T (A minor: A B C D E F G A). The harmonic minor raises the seventh, giving a distinctive augmented-second gap (A B C D E F G-sharp A), and the melodic minor raises the sixth and seventh ascending but reverts descending.
Modes are scales built on different degrees of the major scale. Dorian (D to D on the white notes) sounds minor with a raised sixth; Mixolydian (G to G) sounds major with a flattened seventh and is common in folk and rock; Aeolian is the natural minor. The pentatonic scale uses five notes (major pentatonic: C D E G A) and appears across folk, pop and many world musics. The blues scale adds the flattened "blue" notes (C E-flat F F-sharp G B-flat C) and underpins blues, jazz and much popular music.
Intervals
An interval is the distance between two pitches. Name it by number (count the letter names inclusively) and quality (major, minor, perfect, augmented, diminished). The perfect intervals are the unison, fourth, fifth and octave. Seconds, thirds, sixths and sevenths come as major or minor. Useful reference points for ear training: a perfect fifth is the opening of "Twinkle Twinkle"; a major third is the first two notes of "When the Saints"; an octave is the leap in "Somewhere Over the Rainbow". You should identify common intervals by ear in aural tasks.
Triads
A triad is a three-note chord built in thirds: root, third and fifth. The four triad qualities are major (major third plus minor third, for example C E G), minor (minor third plus major third, C E-flat G), diminished (two minor thirds, C E-flat G-flat) and augmented (two major thirds, C E G-sharp). In a major key the triads on each degree are: I major, ii minor, iii minor, IV major, V major, vi minor, vii diminished. Knowing this lets you predict which chords belong to a key.
Seventh chords
Adding a fourth note a third above the fifth gives a seventh chord. The dominant seventh (V7, for example G B D F in C major) is the engine of tonal harmony because it pulls strongly back to the tonic. The major seventh (C E G B) sounds lush and is common in jazz and ballads; the minor seventh (C E-flat G B-flat) is common in funk, soul and jazz.
Progressions and cadences
Chords move in patterns. The most important progressions to recognise are I to IV to V to I (the foundation of much tonal and popular music), the I to vi to IV to V "fifties" progression, the twelve-bar blues (I I I I, IV IV I I, V IV I V), and the ii to V to I jazz cadence. Cadences are the punctuation: a perfect cadence (V to I) closes firmly, a plagal cadence (IV to I) is the "amen" close, an imperfect cadence ends on V leaving the phrase open, and an interrupted cadence (V to vi) surprises the listener.
Hearing and notating pitch
In aural tasks, work from the bass up: find the tonic, decide major or minor, then track the harmonic rhythm and listen for the cadence points. In Music 2 score analysis, label chords with Roman numerals or chord symbols, identify the key and any modulation, and connect harmonic choices to the style. Tying a progression to its genre (twelve-bar blues to rock and roll, ii-V-I to jazz) shows musicological understanding, not just labelling.
Exam-style practice questions
Practice questions written in the style of NESA exam questions on this dot point, with worked answer explainers. The year tag is the paper they imitate, not the source.
2022 HSC6 marksAn excerpt from Next To Me by Rufus Du Sol will be played five times. Describe how pitch is used in this excerpt.Show worked answer →
For 6 marks, describe pitch in detail with supported aural observations that cover melody, range and harmony across the excerpt.
Melody. Describe the vocal or lead melodic line: its contour (mostly stepwise or with leaps), whether it is built from a short repeated melodic idea, and how it sits in the texture.
Range and register. Comment on the pitch range used, for example a high shimmering synthesiser layer sitting above a low bass line, and how the registral spread widens as layers are added.
Harmony and tonality. Identify the underlying chord pattern or pedal, whether the harmony is largely static or moves, and the use of any sustained drone or repeated bass pitch typical of electronic dance music.
A top band answer tracks how pitch material changes between sections (for example a verse that is narrow in range opening out at a chorus or drop) and uses precise vocabulary such as ostinato, pedal, conjunct and disjunct.
2021 HSC4 marksMusic 2 Aural Skills. Based on 'Canon 2 a 2 violini in unisono' from the Goldberg Variations by J.S. Bach, explain how pitch is used in this excerpt, making specific reference to the score.Show worked answer →
For this 4 mark Music 2 part, you must explain pitch with direct reference to the score and bar numbers.
Canonic pitch relationship. The key feature is that the two violins play in canon at the unison: the second voice imitates the first at the same pitch a bar or so later. Quote the bars where the imitation enters and identify the interval of imitation (unison).
Melodic shape and intervals. Describe the contour of the subject, the mix of stepwise movement and leaps, and any sequence where a melodic idea is repeated at a higher or lower pitch.
Tonality and harmony. State the key and comment on the implied harmonic movement created as the two canonic lines combine, including any moments of dissonance and resolution.
For full marks, link the pitch observations to the canonic writing and reference the score at every point, for example "in bars 5 to 6 the second violin restates the opening figure a beat later at the same pitch".