Lesson Notes By Weeks and Term v3 - Senior Secondary 2
Identification of triads/chords
Download the Lessonotes Mobile Nigeria 2025 app for faster lesson access on Android and iPhone.
Identification of triads/chords
Download the Lessonotes Mobile Nigeria 2025 app for faster lesson access on Android and iPhone.
Subject: Music
Class: Senior Secondary 2
Term: 1st Term
Week: 1
Theme: Musical Practice And Performance A : Aural Training I
This page supports the lesson note with a companion video and a short classroom-ready summary.
For class groups and homework, share this lesson page so learners also get the summary, objectives, and full lesson context.
Students should be able to identify the qualities of the different types of triads. write triads of given qualities.
sixth.
Example (C Major): G - C - E (G is the bass note)
E. Identifying Triads: To identify a triad:
1. Stack in Thirds: Rearrange the notes so they are stacked in intervals of thirds (e.g., C-E-G, not E-G-C, to find the root). The lowest note in this stacked arrangement is the root.
2. Identify the Root: The note that is the foundation of the triad.
3. Calculate Intervals: Measure the interval from the root to the third and from the root to the fifth. M3 + P5 = Major m3 + P5 = Minor m3 + d5 = Diminished M3 + A5 = Augmented
4. Identify Inversion: Compare the lowest sounding note to the identified root. If the lowest note is the root, it's root position. If the lowest note is the third, it's first inversion. If the lowest note is the fifth, it's second inversion. A. Introduction to Triads A triad is a chord consisting of three distinct pitches, typically stacked in superposed thirds. It is the most basic form of a chord in tonal harmony. Every triad has a root (the fundamental note), a third above the root, and a fifth above the root.
B. Root Position and Intervals Root Position: A triad is in root position when its root note is the lowest sounding pitch.
Intervals: To understand triad qualities, a clear understanding of major, minor, perfect, augmented, and diminished intervals is necessary.
Major Third (M3): 4 semitones (e.g., C to E).
Minor Third (m3): 3 semitones (e.g., C to Eb).
Perfect Fifth (P5): 7 semitones (e.g., C to G).
Augmented Fifth (A5): 8 semitones (e.g., C to G#).
Diminished Fifth (d5): 6 semitones (e.g., C to Gb). C. Types (Qualities) of Triads There are four primary qualities of triads, each determined by the specific intervals above the root:
1. Major Triad: Construction: Consists of a Major Third (M3) above the root and a Perfect Fifth (P5) above the root.
Interval structure from root: M3 + m3 (interval between 3rd and 5th)
Sound: Bright, stable, and conclusive.
Example (C Major Triad): Root: C Major 3rd above C: E (4 semitones)
Perfect 5th above C: G (7 semitones)
Notes: C - E - G
2. Minor Triad: Construction: Consists of a Minor Third (m3) above the root and a Perfect Fifth (P5) above the root.
Interval structure from root: m3 + M3 (interval between 3rd and 5th)
Sound: Softer, somewhat sad or melancholic, stable.
Example (C Minor Triad): Root: C Minor 3rd above C: Eb (3 semitones)
Perfect 5th above C: G (7 semitones)
Notes: C - Eb - G
3. Diminished Triad: Construction: Consists of a Minor Third (m3) above the root and a Diminished Fifth (d5) above the root.
Interval structure from root: m3 + m3 (interval between 3rd and 5th)
Sound: Tense, unstable, and often used to create tension or lead to another chord.
Example (C Diminished Triad): Root: C Minor 3rd above C: Eb (3 semitones)
Diminished 5th above C: Gb (6 semitones)
Notes: C - Eb - Gb
4. Augmented Triad: Construction: Consists of a Major Third (M3) above the root and an Augmented Fifth (A5) above the root.
Interval structure from root: M3 + M3 (interval between 3rd and 5th)
Sound: Unsettling, mysterious, often used for dreamlike or suspenseful effects.
Example (C Augmented Triad): Root: C Major 3rd above C: E (4 semitones)
Augmented 5th above C: G# (8 semitones)
Notes: C - E - G# D. Inversions of Triads An inversion of a triad occurs when a note other than the root is in the bass (the lowest sounding note). Inversions change the harmonic texture and melodic contour without altering the fundamental quality of the triad.
1. Root Position (5/3 or 5): The root of the triad is the lowest note.
Example (C Major): C - E - G
2. First Inversion (6/3 or 6): The third of the triad is the lowest note. Intervals above the bass note are a third and a sixth.
Example (C Major): E - G - C (E is the bass note)
3. Second Inversion (6/4): The fifth of the triad is the lowest note. Intervals above the bass note are a fourth and a sixth.
Example (C Major): G - C - E (G is the bass note)
E. Identifying Triads: To identify a triad:
1. Stack in Thirds: Rearrange the notes so they are stacked in intervals of thirds (e.g., C-E-G, not E-G-C, to find the root). The lowest note in this stacked arrangement is the root.
2. Identify the Root: The note that is the foundation of the triad.
3. Calculate Intervals: Measure the interval from the root to the third and from the root to the fifth. M3 + P5 = Teacher Activities: Review and Introduction (10 minutes): Begin by briefly reviewing intervals (major/minor thirds, perfect/diminished/augmented fifths) using staff notation and a keyboard (if available). Introduce the concept of a triad as a "three-note chord" and its importance in building harmony. Present the four main types of triads (Major, Minor, Diminished, Augmented) as harmonic "flavours." Demonstration of Triad Construction (20 minutes): Using a whiteboard/chalkboard and a large staff notation, demonstrate how to construct each type of triad from a given root (e.g., C major, C minor, C diminished, C augmented). For each triad, clearly show the root, the interval to the third, and the interval to the fifth. Write the notes on the staff and demonstrate the sound of each triad on a keyboard or guitar (if available), emphasizing their characteristic qualities (bright, sad, tense, mysterious). Repeat with another root (e.g., G or F) to show the general applicability of the rules. Demonstration of Triad Inversions (15 minutes): Using a previously constructed triad (e.g., C Major), demonstrate how to derive its first and second inversions by moving the lowest note up an octave. Clearly write out each inversion on the staff, labelling the bass note for each. Explain the figured bass symbols (5/3, 6/3, 6/4) even if not immediately used in detail for identification. Play each inversion on an instrument, highlighting how the change in bass note affects the sound without changing the chord's fundamental quality.
Guided Aural Identification (15 minutes): Play various triads (in root position initially, then inversions) on a keyboard or guitar. Ask students to identify the quality (Major, Minor, Diminished, Augmented) by listening. Provide immediate feedback. Play simple three-note chords from familiar Nigerian songs (e.g., a basic I-IV-V progression from a church hymn or popular tune) and ask students to identify the qualities.
Student Activities: Interval Identification Practice (In-class): Students visually identify and name various intervals presented on the board. Students listen to intervals played by the teacher and identify them aurally. Triad Construction Practice (Individual/Pair Work): Students draw staff notation and write triads of given qualities on specified roots (e.g., write a D minor triad, an Ab major triad). Students exchange work with a partner for peer checking.
Triad Inversion Practice: Given a triad in root position, students write its first and second inversions on the staff. Students identify the lowest note for each inversion.
Aural Identification (Group/Individual): Students listen attentively as the teacher plays different triads and call out or write down the identified quality and, later, the inversion. Students sing the arpeggio of different triad qualities to internalize their sound.
Eb is the root: Eb to G is M
3. Eb to B is A
5. So Eb-G-B is an Eb Augmented triad.
3. Identify Inversion: The given notes are G - B - Eb. The root is Eb. The lowest note is G, which is the third of the Eb Augmented triad (Eb-G-B).
Therefore, the triad is in First Inversion.
Final Answer: Root: Eb; Quality: Augmented; Inversion: First Inversion.
Commentary: This question highlights the importance of correctly stacking notes in thirds to find the root before determining quality and inversion. Misidentifying the root leads to incorrect analysis. Explain that G-B-Eb might look like a stacked third if read bottom-up, but G is not the root here.
Hymnody and Church Music: Many Nigerian churches feature vibrant choirs and instrumental groups. Understanding triads allows musicians to analyze the harmony of hymns, gospel songs, and contemporary worship music. This knowledge can be applied to creating improvised accompaniments, arranging vocal parts for different sections of the choir, or transcribing popular gospel tunes played on instruments like the keyboard or guitar, enabling more authentic and skilled performances.
Afrobeats and Popular Music Production: Contemporary Nigerian music, particularly Afrobeats, relies heavily on strong chord progressions. Producers and aspiring musicians can apply their knowledge of major, minor, diminished, and augmented triads to build compelling harmonic foundations for their tracks. Identifying triad qualities and inversions helps in understanding how various popular songs achieve their distinct "feel," which in turn informs their own composition and production choices in a digital audio workstation (DAWs) or even traditional band setups.
Traditional Nigerian Music Arrangement: While much traditional Nigerian music is melodic and rhythmic, modern arrangements often incorporate Western harmonic elements. Students can use their understanding of triads to harmonize traditional folk songs or create simple accompaniments for local musical instruments (e.g., Udu, Bata drums, Ekwe, Goje, or even a Western keyboard). This fusion allows for the preservation and contemporary expression of Nigerian musical heritage.