AP Exams: Music Theory Unit 2, Scales, Modes, Dorian, Phrygian, Lydian, Mixolydian, Aeolian, Locrian, Identifying

What Is This?

Modes are specific arrangements of whole and half steps derived from the major scale, each starting on a different degree of the scale. This topic appears in exams to test your understanding of scale theory and your ability to identify and apply different modes in musical contexts. Questions typically involve identifying modes, constructing them, or applying them in compositions.

Why It Matters

Modes are tested in music theory exams, such as those from the Royal Conservatory of Music, ABRSM, and AP Music Theory. They frequently appear and can carry significant marks, often 10-20% of the total score. This topic tests your ability to recognize and apply musical patterns, a fundamental skill in music theory and composition.

Core Concepts

• Modes are derived from the major scale: Each mode starts on a different degree of the major scale but uses the same notes.
• Each mode has a unique pattern of whole and half steps: This pattern determines the mode's characteristic sound.
• Modes have specific names and uses: Dorian, Phrygian, Lydian, Mixolydian, Aeolian, and Locrian each have unique applications in music.
• Distinguish between major/minor and modal scales: Examiners often test your ability to differentiate between these scale types.

Prerequisites

• Understanding of the major scale and its construction.
• Knowledge of whole and half steps.
• Familiarity with scale degrees and their functions.

Without these, you'll struggle to grasp the concept of modes and their derivation from the major scale.

The Rule-Book (How It Works)

Primary Rule

Modes are derived from the major scale by starting on a different degree while using the same notes.

Sub-rules and Patterns

Mnemonic

Remember the modes in order by their starting degrees: Dorian (2), Phrygian (3), Lydian (4), Mixolydian (5), Aeolian (6), Locrian (7).

Exam / Job / Audit Weighting

• Frequency: Common
• Difficulty Rating: Intermediate
• Question Type: Identification, construction, application in composition

Difficulty Level

Intermediate

Must-Know Rules, Formulas, Standards, or Principles

1. Mode Derivation: Each mode starts on a different degree of the major scale.
2. Step Patterns: Each mode has a unique pattern of whole (W) and half (H) steps.
3. Characteristic Sounds: Each mode has a distinct sound due to its step pattern.

Worked Examples (Step-by-Step)

Easy

Question: Identify the mode that starts on the 4th degree of the C major scale.

Reasoning:
1. The C major scale is C-D-E-F-G-A-B-C.
2. The 4th degree is F.
3. The mode starting on F using the notes of C major is Lydian.

Answer: Lydian

Medium

Question: Construct the A Phrygian mode.

Reasoning:
1. Phrygian starts on the 3rd degree of the major scale.
2. The major scale starting on F (since A is the 3rd degree) is F-G-A-Bb-C-D-E-F.
3. A Phrygian is A-Bb-C-D-E-F-G-A.

Answer: A-Bb-C-D-E-F-G-A

Hard

Question: Write a short melody using the E Locrian mode.

Reasoning:
1. Locrian starts on the 7th degree of the major scale.
2. The major scale starting on F (since E is the 7th degree) is F-G-A-Bb-C-D-E-F.
3. E Locrian is E-F-G-A-Bb-C-D-E.
4. Compose a melody using these notes.

Answer: (Example melody using E-F-G-A-Bb-C-D-E)

Common Exam Traps & Mistakes

1. Confusing Modes with Major/Minor Scales: Remember, modes use the same notes as the major scale but start on different degrees.
2. Incorrect Step Patterns: Ensure you memorize the unique step pattern for each mode.
3. Misidentifying Starting Degrees: Double-check the starting degree of each mode.
4. Forgetting the Locrian Mode: Locrian is often overlooked due to its less common use.

Shortcut Strategies & Exam Hacks

• Memorize Starting Degrees: Knowing the starting degree of each mode helps quickly identify them.
• Pattern Recognition: Recognize the step patterns to quickly construct modes.
• Practice Identification: Regularly practice identifying modes from given scales to build speed and accuracy.

Question-Type Taxonomy

1. Identification: "Which mode starts on the 5th degree of the major scale?" (Favored by ABRSM)
2. Construction: "Construct the D Dorian mode." (Favored by Royal Conservatory)
3. Application: "Compose a melody using the G Mixolydian mode." (Favored by AP Music Theory)

Practice Set (MCQs)

Question 1

Question: Which mode starts on the 6th degree of the major scale? Options: A) Dorian B) Phrygian C) Aeolian D) Locrian

Correct Answer: C) Aeolian Explanation: Aeolian starts on the 6th degree of the major scale. Why the Distractors Are Tempting: Dorian and Phrygian are common modes, and Locrian is often confused due to its rarity.

Question 2

Question: What is the step pattern for the Lydian mode? Options: A) W-H-W-W-H-W-W B) W-W-W-H-W-W-H C) W-W-H-W-W-H-W D) H-W-W-H-W-W-W

Correct Answer: B) W-W-W-H-W-W-H Explanation: Lydian has a unique pattern of three whole steps followed by a half step. Why the Distractors Are Tempting: The other patterns are valid for different modes.

Question 3

Question: Construct the B Mixolydian mode. Options: A) B-C-D-E-F-G-A-B B) B-C#-D-E-F#-G-A-B C) B-C#-D#-E-F#-G#-A-B D) B-C#-D-E-F#-G-A-B

Correct Answer: D) B-C#-D-E-F#-G-A-B Explanation: Mixolydian starts on the 5th degree of the E major scale. Why the Distractors Are Tempting: The other options include notes not in the E major scale.

Question 4

Question: Which mode has the step pattern H-W-W-H-W-W-W? Options: A) Dorian B) Phrygian C) Locrian D) Aeolian

Correct Answer: C) Locrian Explanation: Locrian has a unique pattern starting with a half step. Why the Distractors Are Tempting: The other patterns are valid for different modes.

Question 5

Question: Identify the mode that starts on the 2nd degree of the G major scale. Options: A) Dorian B) Phrygian C) Lydian D) Mixolydian

Correct Answer: A) Dorian Explanation: Dorian starts on the 2nd degree of the major scale. Why the Distractors Are Tempting: The other modes start on different degrees.

30-Second Cheat Sheet

• Modes are derived from the major scale starting on different degrees.
• Each mode has a unique pattern of whole and half steps.
• Dorian: 2nd degree, W-H-W-W-W-H-W
• Phrygian: 3rd degree, H-W-W-W-H-W-W
• Lydian: 4th degree, W-W-W-H-W-W-H
• Mixolydian: 5th degree, W-W-H-W-W-H-W
• Aeolian: 6th degree, W-H-W-W-H-W-W
• Locrian: 7th degree, H-W-W-H-W-W-W

Learning Path

1. Beginner Foundation: Review the major scale and its construction.
2. Core Rules: Learn the starting degrees and step patterns for each mode.
3. Practice: Identify and construct modes from given scales.
4. Timed Drills: Practice identifying modes under time pressure.
5. Mock Tests: Take full practice exams to simulate test conditions.

Related Topics

1. Major and Minor Scales: Understanding these is foundational to grasping modes.
2. Harmonic and Melodic Minor Scales: These scales have unique modes derived from them.
3. Chord Construction: Modes are often used to build chords in music theory.