Lesson Notes By Weeks and Term v3 - Senior Secondary 1
interval
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interval
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Subject: Music
Class: Senior Secondary 1
Term: 1st Term
Week: 5
Theme: Theory Of Music 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 distance between two notes; distinguish other notes of the key.
typically 2nds, 3rds, 6ths, and 7ths. Perfect intervals do not become minor; they become diminished if reduced by a semitone.
To find a Minor interval: Take a Major interval and lower the upper note by one semitone, OR raise the lower note by one semitone.
Examples: C to Eb = Minor Third (C to E is Major Third; E lowered by a semitone is Eb) C to Bb = Minor Seventh (C to B is Major Seventh; B lowered by a semitone is Bb) D to F = Minor Third (D to F# is Major Third; F# lowered by a semitone is F)
Augmented Intervals: A Major or Perfect interval raised by a semitone. (e.g., C to F# is Augmented Fourth - F is P4, F# is Aug4).
Diminished Intervals: A Minor or Perfect interval lowered by a semitone. (e.g., C to Bbb is Diminished Seventh - B is M7, Bb is m7, Bbb is Dim7).
Note to Teacher: For SS1 Week 1, focus heavily on Perfect, Major, and Minor. Introduce Augmented/Diminished as concepts that exist but are beyond the primary scope of this introductory lesson, unless students grasp the main concepts quickly.
C. Visual Representation on the Staff: Treble Clef (G Clef): Lines: E G B D F Spaces: F A C E Bass Clef (F Clef): Lines: G B D F A Spaces: A C E G Teachers should draw examples on the board, showing two notes and then counting the lines and spaces between them to determine the numeric interval, and then relating it to the major scale to determine quality. A. Definition of an Interval An interval in music refers to the distance in pitch between any two notes. It is the fundamental building block of both melody (notes played one after another) and harmony (notes played simultaneously).
B. Types of Intervals
1. Melodic vs.
Harmonic Intervals: Melodic Interval: Occurs when two notes are played or sung one after the other. It describes the "jump" or "step" between consecutive notes in a melody. For example, singing "Do-Re" involves a melodic interval.
Harmonic Interval: Occurs when two notes are played or sung at the same time. This creates a chordal effect and is the basis of harmony. For example, playing "Do" and "Mi" simultaneously on a piano creates a harmonic interval.
2. Numeric Size of Intervals (Quantity): The numeric size of an interval is determined by counting the number of letter names (or staff positions – lines and spaces) from the lower note to the upper note, including both notes.
Unison (1st): Two identical notes (e.g., C to C).
Second (2nd): The distance from one note to the next adjacent note (e.g., C to D).
Third (3rd): The distance from one note skipping one note in between (e.g., C to E).
Fourth (4th): (e.g., C to F).
Fifth (5th): (e.g., C to G).
Sixth (6th): (e.g., C to A).
Seventh (7th): (e.g., C to B).
Octave (8th): The distance from one note to the next note of the same name, higher or lower (e.g., C to the C an octave higher).
Example (Counting Intervals): From C to E: C (1), D (2), E (3) = a 3rd.
From G to C (above G): G (1), A (2), B (3), C (4) = a 4th.
From D to B (above D): D (1), E (2), F (3), G (4), A (5), B (6) = a 6th.
3. Quality of Intervals (Specifics): Once the numeric size is determined, the quality of an interval describes its exact size in semitones (half-steps) and its characteristic sound. The qualities are Perfect, Major, Minor, Augmented, and Diminished. For SS1, the focus will primarily be on Perfect, Major, and Minor intervals, as they are most common and foundational. To determine the quality, one typically references the major scale of the lower note.
Perfect Intervals: Unisons (1st), Fourths (4ths), Fifths (5ths), and Octaves (8ths) are generally Perfect when the upper note is found within the major scale of the lower note. They have a stable, consonant sound. Examples from C Major Scale (C-D-E-F-G-A-B-C): C to C = Perfect Unison C to F = Perfect Fourth (F is the 4th note in C major) C to G = Perfect Fifth (G is the 5th note in C major) C to C (octave) = Perfect Octave Major Intervals: Seconds (2nds), Thirds (3rds), Sixths (6ths), and Sevenths (7ths) are generally Major when the upper note is found within the major scale of the lower note. They have a bright, consonant sound.
Examples from C Major Scale: C to D = Major Second (D is the 2nd note in C major) C to E = Major Third (E is the 3rd note in C major) C to A = Major Sixth (A is the 6th note in C major) C to B = Major Seventh (B is the 7th note in C major)
Minor Intervals: A Minor interval is a semitone (half-step) smaller than its corresponding Major interval. Minor intervals are typically 2nds, 3rds, 6ths, and 7ths. Perfect intervals do not become minor; they become diminished if reduced by a semitone.
To find a Minor interval: Take a Major interval and lower the upper note by one semitone, OR raise the lower note by one semitone.
Examples: C to Eb = Minor Third (C to E is Major Third; E lowered by a semitone is Eb) C to Bb = Minor Seventh (C to B is Major Seventh; B lowered by a semitone is Bb) * D to F
A. Teacher Activities: Introduction & Review (10 mins): Begin by reviewing basic music notation: staff, clefs (Treble and Bass), note names, and the C major scale. Play simple two-note sequences on a keyboard or sing them, asking students if they notice the "distance" between the notes. Introduce the term "interval" as the musical distance between two notes.
Explaining Numeric Size (15 mins): Define melodic and harmonic intervals, demonstrating both on a keyboard/piano or by singing.
Explain how to count intervals: starting from the lower note, counting lines and spaces up to the upper note, including both notes. Draw several pairs of notes on the chalkboard (e.g., C to F, D to A, G to E) and guide students through counting them. Emphasize that the octave is an 8th, not a 1st (as it is a repetition of the note at a higher or lower pitch).
Explaining Interval Quality (20 mins): Introduce the concept of interval quality (Perfect, Major, Minor). Explain that Unisons, 4ths, 5ths, and Octaves are usually Perfect. Demonstrate with C-C, C-F, C-G, C-C (octave). Explain that 2nds, 3rds, 6ths, and 7ths are usually Major in a Major scale. Demonstrate with C-D, C-E, C-A, C-B. Explain how Minor intervals are derived from Major intervals by lowering the upper note by a semitone (or raising the lower note). Demonstrate C-Eb (minor 3rd) and C-Bb (minor 7th). Play these intervals on a keyboard, highlighting their distinct sounds.
Relate to Nigerian music: Point out that sometimes Nigerian folk music uses intervals that might not strictly adhere to Western major/minor qualities, but the underlying concept of distance remains. Specific Focus on 6th, 7th, and Octave (10 mins): As per the evaluation guide, give special attention to 6ths, 7ths, and Octaves. Draw and identify examples of Major 6th, Minor 6th, Major 7th, Minor 7th, and Perfect Octave, originating from
C. Demonstrate their sounds.
Guided Practice Setup (5 mins): Distribute staff paper to students. Set up guided practice questions on the board.
B. Student Activities: Participation & Identification (Throughout): Identify notes on the staff as reviewed by the teacher. Listen to intervals played by the teacher and attempt to describe them (e.g., "sounds like a big jump," "sounds close"). Actively participate in counting exercises when the teacher draws notes on the board.
Oral Response (10 mins): Students will orally identify the numeric size and quality of intervals played by the teacher. Students will orally identify the numeric size of intervals drawn on the board.
Written Practice (15 mins): Students will copy down and write notes for the given intervals in the guided practice section on their staff paper. Students will identify the numeric size and quality of intervals provided by the teacher on the chalkboard. The teacher should provide these questions on the board and guide students through finding the answers collaboratively, explaining the reasoning at each step.
Question 1: Identify the numeric size of the following intervals: a) From C to G (Treble Clef) b) From E to A (Treble Clef) c) From D to B (Bass Clef) d) From F to C (above F, Bass Clef)
Solution 1: a)
C to G: Counting C(1), D(2), E(3), F(4), G(5). This is a 5th. b)
E to A: Counting E(1), F(2), G(3), A(4). This is a 4th. c)
D to B: Counting D(1), E(2), F(3), G(4), A(5), B(6). This is a 6th. d)
F to C (above F): Counting F(1), G(2), A(3), B(4), C(5). This is a 5th.
Commentary: This exercise reinforces the basic skill of counting lines and spaces to determine the numeric size of an interval.
Question 2: Identify the numeric size AND quality (Perfect, Major, or Minor) of the following intervals from C in the Treble Clef: a) C to A b)
C to F c)
C to Eb d)
C to G Solution 2: a)
C to A: Numeric size: C(1), D(2), E(3), F(4), G(5), A(6). This is a 6th.
Quality: In the C Major scale, A is the 6th note.
Therefore, C to A is a Major 6th. b)
C to F: Numeric size: C(1), D(2), E(3), F(4). This is a 4th.
Quality: In the C Major scale, F is the 4th note. 4ths are typically Perfect.
Therefore, C to F is a Perfect 4th. c)
C to Eb: Numeric size: C(1), D(2), E(3). This is a 3rd.
Quality: In the C Major scale, E is the 3rd note (Major 3rd). Eb is a semitone lower than
E. Therefore, C to Eb is a Minor 3rd. d)
C to G: Numeric size: C(1), D(2), E(3), F(4), G(5). This is a 5th.
Quality: In the C Major scale, G is the 5th note. 5ths are typically Perfect.
Therefore, C to G is a Perfect 5th.
Commentary: This question guides students through applying the rules for quality, using the C major scale as a reference.
Question 3: On a blank staff (Treble Clef), draw the following intervals above the given tonic note: a) Major 6th above C b) Minor 7th above E c)
Perfect Octave above G Solution 3: a)
Major 6th above C: Start with
C. Count up six notes: C, D, E, F, G, A. So the note is
A. In C major, C to A is a Major 6th. So, simply draw an A above C. b)
Minor 7th above E: Start with
E. Count up seven notes: E, F, G, A, B, C,
D. So the note is
D. Now, consider the E Major scale: E F# G# A B C# D#. The Major 7th above E is D#. To make it a Minor 7th, we lower the D# by a semitone, resulting in D natural. So, draw an E and a D natural above it. c)
Perfect Octave above G: Start with
G. Count up eight notes: G, A, B, C, D, E, F, G. So the note is the G an octave higher. Octaves are Perfect. So, draw a G and the G an octave higher above it.
Commentary: This tests students' ability to construct intervals, which requires understanding both numeric size and quality, and applying accidental rules.
Nigerian Choral Music and Church Choirs: Intervals are the building blocks of harmony. In many Nigerian churches and schools, choirs are prevalent. Understanding intervals helps choir members sing their parts accurately and blend harmoniously. For example, knowing the sound of a Perfect 4th or Major 3rd helps a tenor maintain their harmony against a soprano, a skill crucial for the rich vocal textures common in Nigerian gospel music.
Traditional Nigerian Instrumental Music: Instruments like the `Goje` (one-stringed fiddle), `Xalam` (lute), or `Sakara` drum (which can vary pitch) often play melodic lines and accompanying figures that rely on specific interval relationships. Understanding intervals allows for a deeper appreciation of how these instruments create their unique soundscapes and how melodies are constructed within a particular mode or scale used in traditional Nigerian music (e.g., the characteristic 4ths and 5ths often heard in accompanying ostinatos).
Appreciation and Analysis of Music: Whether listening to contemporary Afrobeats, Highlife, or a classical piece, an understanding of intervals allows students to "hear" the relationships between notes. They can identify melodic contours (leaps vs. steps) and distinguish between consonant (stable) and dissonant (tense) harmonies, which are vital for critically analyzing and appreciating the structure and emotional impact of any piece of music, including popular Nigerian songs.