Class: Senior Secondary School 1 (SS1, SS 1, SSS1, SSS 1)
Term: 3rd Term
Week: 2
Age: 15 years
Duration: 45 minutes
Subject: Music
Curriculum Theme: Music
Previous Lesson: Diatonic Scales: Major, Minor and Circle of Fifths.
Topic: Intervals.
Subject Matter: Meaning of intervals, inversion of intervals, table of interval inversions, completing inversion statements, writing inversions of given intervals.

Specific Objectives

By the end of the lesson, pupils should be able to:

Cognitive Domain:

Define an interval and explain the concept of interval inversion.
State the rule for determining the inversion of an interval.
Identify various intervals and their corresponding inversions.

Affective Domain:

Appreciate the importance of understanding interval inversions in music theory.
Show interest in exploring different musical intervals.

Psychomotor Domain:

Accurately complete inversion statements for given intervals.
Correctly write the inversions of specified intervals.

Collaborate effectively with peers when identifying and inverting intervals.

Reference Materials

The following resources were used in planning this lesson:

9 Years Basic Education Curriculum (Senior Secondary Music)
State Unified Scheme of Work for Senior Secondary Music
New Oxford Secondary Music Book 1 for SSS 1

Instructional Materials

The teacher will teach this lesson with the aid of:

Interval inversion table chart
Keyboard chart
Note cards

Rationale for the Lesson

Understanding intervals and their inversions helps pupils to grasp fundamental concepts in harmony and counterpoint. This knowledge is important for analyzing musical compositions and for composing their own music effectively.

Prerequisite/Previous Knowledge

Pupils should have basic knowledge of musical notes, scales, and simple intervals (e.g., 2nd, 3rd, 4th, 5th, 6th, 7th, 8th).

Lesson Content/Board Summary

Intervals and their Inversions

Meaning of Intervals

An interval in music is the distance between two notes. It is measured by the number of scale degrees between the two notes, including the starting and ending notes.

Meaning of Interval Inversion

Interval inversion is the process of reversing the order of the two notes that form an interval. When an interval is inverted, the lower note becomes the upper note, and the upper note becomes the lower note, moving it up or down an octave.

Rule for Interval Inversion

When an interval is inverted, its quality and number change. The sum of the original interval number and its inverted interval number will always be 9.

For example, a 2nd inverts to a 7th (2 + 7 = 9).

The qualities also change as follows:

Major inverts to minor.
Minor inverts to major.
Augmented inverts to diminished.
Diminished inverts to augmented.
Perfect inverts to perfect.

Table of Interval Inversions

The following table shows common intervals and their inversions:

Unison (1st) inverts to Octave (8th)
2nd inverts to 7th
3rd inverts to 6th
4th inverts to 5th
5th inverts to 4th
6th inverts to 3rd
7th inverts to 2nd
Octave (8th) inverts to Unison (1st)

Completing Inversion Statements

To complete an inversion statement, identify the given interval and apply the rule of 9 for the number, and the quality change rule for the quality.

Example: A Major 3rd inverts to a ______ ______.

Solution: A Major 3rd inverts to a minor 6th (3+6=9, Major to minor).

Writing Inversions of Given Intervals

To write the inversion of a given interval, take the lower note of the original interval and move it up an octave, or take the upper note and move it down an octave. Then, identify the new interval formed.

Teaching Methods/Instructional Techniques

Discussion, Lecture, Demonstration, Question and Answer, Visual Aids

Instructional Procedures

Step 1: Introduction

Time: 5 minutes
Teaching Skill: Set Induction
Teacher’s Activity: The teacher greets the pupils and reviews the previous lesson on basic intervals. The teacher then introduces the topic of interval inversions by asking pupils what happens when something is “inverted” or “turned upside down”.
Pupils’ Activity: Pupils respond to the teacher’s questions and recall previous knowledge about intervals.
Learning Point: Pupils are prepared for the new lesson and connect it to prior learning.

Step 2: Meaning of Intervals

Time: 7 minutes
Teaching Skill: Explanation/Definition
Teacher’s Activity: The teacher clearly defines what an interval is in music, using examples on the keyboard chart and note cards. The teacher ensures pupils understand how intervals are named (e.g., 2nd, 3rd).
Pupils’ Activity: Pupils listen, take notes, and identify intervals demonstrated by the teacher.
Learning Point: Pupils understand the fundamental concept of an interval.

Step 3: Meaning of Interval Inversion

Time: 7 minutes
Teaching Skill: Explanation/Demonstration
Teacher’s Activity: The teacher explains the concept of interval inversion as reversing the notes of an interval. Using the keyboard chart, the teacher demonstrates how an interval changes when inverted (e.g., C to E (3rd) becomes E to C (6th) by moving C up an octave).
Pupils’ Activity: Pupils observe the demonstration and listen to the explanation, asking questions for clarity.
Learning Point: Pupils grasp the idea of interval inversion.

Step 4: Rule for Interval Inversion

Time: 7 minutes
Teaching Skill: Rule Formation/Guidance
Teacher’s Activity: The teacher introduces the “rule of 9” for interval numbers (original + inverted = 9) and explains how interval qualities change (e.g., Major to minor, Perfect to Perfect). The teacher writes these rules on the board.
Pupils’ Activity: Pupils listen, copy the rules, and ask questions to clarify their understanding.
Learning Point: Pupils learn the specific rules governing interval inversions.

Step 5: Table of Interval Inversions

Time: 7 minutes
Teaching Skill: Visual Aid/Consolidation
Teacher’s Activity: The teacher displays the interval inversion table chart and explains each pair of inversions (e.g., 2nd inverts to 7th). The teacher guides pupils to copy the table into their notebooks.
Pupils’ Activity: Pupils observe the chart, ask questions, and accurately copy the table into their notes.
Learning Point: Pupils consolidate their understanding of common interval inversions.

Step 6: Practical Application

Time: 5 minutes
Teaching Skill: Guided Practice
Teacher’s Activity: The teacher provides examples of completing inversion statements and writing inversions of given intervals. For instance, the teacher asks, “What is the inversion of a perfect 4th?” and guides pupils to the answer (perfect 5th).
Pupils’ Activity: Pupils participate in solving the examples, applying the rules learned.
Learning Point: Pupils practice applying the rules of interval inversion.

Step 7: Evaluation/Review

Time: 5 minutes

Teaching Skill: Questioning/Assessment

Teacher’s Activity: The teacher evaluates the learning by asking the following questions:

Define an interval in your own words.
Explain what is meant by interval inversion.
State the rule that applies to the numbers of an interval and its inversion.
Mention what a Major 2nd inverts to.

Pupils’ Activity: Pupils answer orally and in writing.

Learning Point: Pupils demonstrate understanding of the lesson.

Step 8: Conclusion

Time: 2 minutes
Teaching Skill: Summarization/Assignment
Teacher’s Activity: The teacher summarizes the key points of the lesson on intervals and their inversions. The teacher then assigns homework, asking pupils to invert a list of given intervals (e.g., minor 3rd, augmented 4th, perfect 5th).
Pupils’ Activity: Pupils listen to the summary and copy the homework assignment.
Learning Point: Pupils review the lesson and are given tasks to reinforce learning.

Lesson Keywords

Interval – The distance between two notes.
Inversion – Reversing the order of notes in an interval.
Unison – An interval of zero distance, two notes of the same pitch.
Octave – An interval spanning eight scale degrees.
Major – A quality of intervals often associated with brightness.
Minor – A quality of intervals often associated with sadness.
Perfect – A stable quality of intervals (unison, 4th, 5th, octave).
Augmented – An interval that has been enlarged by a semitone from its major or perfect form.
Diminished – An interval that has been reduced by a semitone from its minor or perfect form.

Differentiation

For pupils who grasp the concept quickly, the teacher can provide more complex intervals to invert or ask them to identify inverted intervals in short musical excerpts. For pupils needing more support, the teacher will provide additional one-on-one guidance, simplify the examples, and allow more time for practice with the inversion table chart.

Note for teachers using this lesson plan

Ensure that the keyboard chart and note cards are clearly visible to all pupils. Encourage active participation and allow pupils to demonstrate inversions on the keyboard if available. Emphasize the “rule of 9” and the quality changes, as these are fundamental to mastering interval inversions.