Principles and Practice in Two-Part Harmony for SS 3

Class: SS 3
Term: First Term
Week: 1
Age: 16 years
Duration: 45 minutes
Subject: Music
Curriculum Theme: Harmony
Previous Lesson:
Topic: Harmony
Subject Matter: Two-parts harmony

Specific Objectives

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

Cognitive Domain

• Define two-part harmony.
• State the basic principles of voice leading in two-part harmony.
• Identify different types of motion (parallel, contrary, oblique) between two parts.
• Explain how to analyze chords in a two-part musical excerpt.

Affective Domain

• Appreciate the importance of proper voice leading in creating musical balance.
• Develop an interest in composing and arranging music.
• Demonstrate patience and attention to detail when harmonizing melodies.

Psychomotor Domain

• Harmonize a given simple melody in two parts, applying basic voice-leading rules.
• Analyze and identify the implied chords in a short two-part musical passage.

Reference Materials

The following resources were used in planning this lesson:

• 2025 Revised 9 Years Basic Education Curriculum
• Relevant State Unified Scheme of Work
• Music Theory textbooks for Senior Secondary Schools
• The HeadTeacher Scheme of work

Instructional Materials

The teacher will teach this lesson with the aid of:

• Whiteboard and markers
• Musical scores displaying examples of two-part harmony
• A keyboard or piano for demonstration
• Staff paper and pencils for students

Rationale for the Lesson

Understanding two-part harmony is fundamental to developing a strong foundation in music theory and composition. This lesson equips students with the knowledge and practical skills to create melodically and harmonically sound musical textures. It enhances their analytical abilities and prepares them for more complex harmonic studies.

Prerequisite/Previous Knowledge

Students should have a basic understanding of musical notation, intervals, scales, and primary chords (triads) in major and minor keys.

Lesson Content/Board Summary

Harmony

Two-Parts Harmony

Two-part harmony involves two independent melodic lines that are played or sung simultaneously, creating a harmonic texture. Each part retains its melodic interest while combining to form a coherent musical whole.

Principles of Two-Part Harmony (Voice Leading)

Voice leading refers to the way individual melodic lines move in relation to each other within a harmonic context. Key principles include:

1. Melodic Motion: Each part should move smoothly, primarily by step (conjunct motion) or small leaps (disjunct motion).
2. Harmonic Motion: This describes the relationship between the two parts as they move from one note to another:
   1. Parallel Motion: Both parts move in the same direction by the same interval (e.g., both move up a third). This should be used sparingly, especially parallel perfect octaves and perfect fifths, which are generally avoided in strict counterpoint.
   2. Contrary Motion: The parts move in opposite directions (e.g., one moves up while the other moves down). This is often preferred for good voice leading as it creates independence.
   3. Oblique Motion: One part remains stationary while the other part moves. This also helps to create melodic independence.
3. Avoiding Parallel Octaves and Fifths: Strict two-part writing generally avoids consecutive perfect octaves and perfect fifths between the two parts. These create a sense of melodic stagnation and lack of independence.
4. Consonance and Dissonance: The intervals formed between the two parts should primarily be consonant (thirds, sixths, perfect unisons, perfect octaves, perfect fifths), with dissonance (seconds, sevenths) used carefully as passing notes or suspensions, resolving to consonance.
5. Range and Crossing of Parts: Each part should generally remain within a comfortable vocal or instrumental range. Parts should generally not cross, meaning the upper part should stay above the lower part, to maintain clarity.

Steps for Harmonizing a Melody in Two Parts

To harmonize a given melody in two parts, consider the following steps:

1. Analyze the Melody: Determine the key, meter, and rhythmic characteristics of the given melody.
2. Identify Implied Chords: For each melodic note, consider the most suitable underlying harmony (chord) from the key.
3. Choose the Harmonic Interval: Decide whether the second part will be above or below the melody. Common intervals used are thirds, sixths, and sometimes perfect fifths or octaves at cadences.
4. Apply Voice Leading Rules:
   1. Prioritize contrary and oblique motion.
   2. Avoid parallel perfect octaves and perfect fifths.
   3. Ensure smooth melodic contour in both parts.
   4. Use consonant intervals for strong beats.
5. Review and Refine: Play or sing the harmonized passage to check for smoothness, balance, and adherence to the principles.

Analyzing Chords in Two-Part Harmony

To analyze the implied chords in a two-part musical excerpt:

1. Identify the Key: Determine the overall key of the piece.
2. Examine Vertical Intervals: Look at the intervals formed between the two parts at each beat or significant rhythmic point.
3. Infer Chord Tones: Based on the notes present in both parts and the key, infer the complete chord that is being outlined. For example, if the notes are C and E in the key of C major, the implied chord is C major (C-E-G), with the G being absent.
4. Label the Chords: Use Roman numerals (I, IV, V, etc.) to label the implied chords, indicating their function within the key.

Teaching Methods/Instructional Techniques

Discussion, Demonstration, Guided Practice, Question and Answer, Explanation, Practical Activity, Individual Practice

Instructional Procedures

Step 1: Introduction

Time: 5 minutes

Teaching Skill: Review/Engaging

Teacher’s Activity: The teacher greets the students and reviews previous knowledge on intervals and basic chords by asking questions like, “What is an interval?” and “Can you name the primary chords in C major?”

Pupils’ Activity: Students respond to the questions, recalling their prior knowledge of intervals and chords.

Learning Point: Recall of intervals and chords

Step 2: Introduction to Two-Part Harmony

Time: 7 minutes

Teaching Skill: Explanation/Demonstration

Teacher’s Activity: The teacher introduces the concept of two-part harmony, explaining that it involves two independent melodic lines sounding together. The teacher plays simple examples on the keyboard or displays scores.

Pupils’ Activity: Students listen attentively, observe the examples, and ask clarifying questions.

Learning Point: Definition of two-part harmony

Step 3: Principles of Voice Leading

Time: 8 minutes

Teaching Skill: Explanation/Illustration

Teacher’s Activity: The teacher explains the key principles of voice leading in two-part harmony, including melodic motion, harmonic motion (parallel, contrary, oblique), and the avoidance of parallel octaves and fifths. The teacher illustrates each principle with simple musical examples.

Pupils’ Activity: Students listen, take notes, and analyze the examples provided by the teacher, identifying the different types of motion.

Learning Point: Voice leading principles

Step 4: Demonstrating Harmonization

Time: 7 minutes

Teaching Skill: Demonstration/Modelling

Teacher’s Activity: The teacher demonstrates how to harmonize a very simple, short melody in two parts on the whiteboard or keyboard, applying the voice-leading rules discussed. The teacher explains each decision made during the harmonization process.

Pupils’ Activity: Students observe the teacher’s demonstration, paying close attention to the application of harmonization rules.

Learning Point: Practical harmonization demonstration

Step 5: Guided Practice in Harmonizing

Time: 6 minutes

Teaching Skill: Guided Practice/Support

Teacher’s Activity: The teacher provides a short, simple melody for students to attempt harmonizing in pairs or individually. The teacher moves around, offering guidance and correcting common errors.

Pupils’ Activity: Students engage in guided practice, attempting to harmonize the given melody on staff paper, applying the learned principles.

Learning Point: Application of harmonization rules

Step 6: Introduction to Chord Analysis

Time: 4 minutes

Teaching Skill: Explanation/Analysis

Teacher’s Activity: The teacher explains how to analyze the implied chords in a two-part passage, demonstrating with a simple example on the board. The teacher guides students to identify the key and infer the chords.

Pupils’ Activity: Students listen and participate in the analysis of the example, identifying the key and discussing possible implied chords.

Learning Point: Two-part chord analysis

Step 7: Evaluation/Review

Time: 5 minutes

Teaching Skill: Questioning/Assessment

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

1. What is two-part harmony?
2. Name three types of motion between two parts.
3. Why are parallel perfect octaves and fifths generally avoided in two-part writing?
4. Harmonize the first two measures of a simple melody provided on the board.

Pupils’ Activity: Pupils answer orally and in writing.

Learning Point: Understanding of two-part harmony

Step 8: Note-Taking

Time: 4 minutes

Teaching Skill: Guided Writing

Teacher’s Activity: The teacher guides pupils/students to copy the essential Board Summary notes on two-part harmony principles and steps into their notebooks.

Pupils’ Activity: Pupils/students copy the notes carefully into their notebooks.

Learning Point: Recording lesson content

Step 9: Conclusion

Time: 2 minutes

Teaching Skill: Summarizing

Teacher’s Activity: The teacher briefly summarizes the key concepts of two-part harmony, emphasizing the importance of good voice leading and practice. The teacher encourages students to listen for two-part textures in music.

Pupils’ Activity: Students listen and prepare for the next lesson.

Learning Point: Reinforcement of harmony concepts

Continuous Assessment/Further Study

Type: Homework

Instruction: Complete the following tasks in your music theory notebook:

1. Harmonize the provided 4-measure melody in two parts, ensuring good voice leading.
2. Analyze the implied chords for the given two-part musical excerpt (provided by the teacher).
3. Identify and correct any instances of parallel octaves or fifths in a short, faulty two-part harmonization.

Lesson Keywords

• Harmony – The combination of simultaneously sounded musical notes to produce chords and chord progressions.
• Two-part harmony – Music consisting of two independent melodic lines played or sung together.
• Voice leading – The melodic movement of individual parts in relation to each other.
• Parallel motion – Both parts moving in the same direction by the same interval.
• Contrary motion – Parts moving in opposite directions.
• Oblique motion – One part stationary while the other moves.
• Chord analysis – Identifying and labeling the underlying harmonies in a musical passage.

Differentiation

For students who grasp the concepts quickly, provide more complex melodies to harmonize or ask them to analyze longer two-part excerpts. For students needing more support, offer simpler melodies with clear harmonic implications and provide more direct guidance during harmonization practice.

Suggested Lesson Videos

Search YouTube for:

• “Introduction to Two-Part Harmony”
• “Voice Leading Rules Explained”
• “How to Harmonize a Melody in Two Parts”

Teacher Guide for Using This Lesson Plan

Before the lesson, ensure you have prepared clear musical examples of two-part harmony, different types of motion, and a simple melody for harmonization practice. A keyboard or piano is highly recommended for live demonstrations. Begin by activating students’ prior knowledge of intervals and chords. Systematically introduce the definition of two-part harmony and its core voice-leading principles, using visual aids and auditory examples. Guide students through practical harmonization steps, allowing them to attempt exercises with your supervision. Emphasize the importance of avoiding parallel perfect octaves and fifths. Conclude by reviewing the main points and assigning homework that reinforces both harmonization and chord analysis skills. Students should copy the Board Summary notes during Step 8.