Getting Started
This chapter builds upon your knowledge of individual pitches and scales. You will learn how the major scale serves as the foundational framework for an entire piece of music, creating a "home base" or tonal center. Understanding this concept, known as key, is the first step toward analyzing the structure and grammar of Western tonal music.
What You Should Be able to Do
Identify the major key of a musical passage by reading its key signature.
Notate any major key signature correctly in both treble and bass clefs.
Name the tonic pitch (^1) for any given major key signature.
Distinguish between diatonic and chromatic pitches within a musical excerpt.
Notate the pitches of a simple, performed melody in a major key.
Key Concepts & Analysis
Music in a particular key is organized around a central pitch called the tonic. This pitch is the first degree (^1) of the scale that is used prominently throughout the piece. In major keys, this underlying scale is the major scale. The specific pattern of whole and half steps in the major scale creates a hierarchy of stability and tension among its pitches, giving the music a sense of direction and arrival. This framework can be understood through the lens of tonal function, where each scale degree has an inherent tendency in relation to the tonic.
Functions & Allowable Motions
Even without full chords, individual scale degrees have functional roles based on their relationship to the tonic. These tendencies are crucial for understanding melody and are the building blocks of harmony.
Tonic Function (Stability): Scale degrees ^1, ^3, and ^5 are the most stable pitches in the key. The tonic (^1) is the ultimate point of rest and resolution. Melodies often end on ^1 to provide a sense of completeness.
Dominant Function (Tension): Scale degree ^5 is the second most important pitch. While stable, it also creates tension that strongly points back to the tonic. The leading tone (^7), just a half step below the tonic, has the most powerful melodic pull in the entire scale, creating a strong expectation to resolve up to ^1.
Predominant Function (Preparation): Scale degrees ^2 and ^4 act as transitional pitches that prepare the arrival of the dominant. Melodically, ^4 tends to resolve down to ^3, while ^2 often moves to ^1 or ^7.
Key-Defining Pitch Relationships
Certain melodic patterns are so common that they strongly signal the key. In melodic dictation, listening for these patterns is essential for identifying the tonic.
The most powerful key-defining motion is from the dominant to the tonic (^5–^1). This is often heard at the end of musical phrases.
The resolution of the leading tone to the tonic (^7–^1) is another unambiguous indicator of the key center.
The prominence of the tonic pitch at the beginning and, more importantly, the end of a melody is the most reliable way to confirm the key.
Identifying the Tonic
The key signature is your first clue to identifying the tonic, but the music itself provides the confirmation.
The Key Signature: A key signature is a collection of sharps or flats at the beginning of a staff that indicates which pitches are consistently altered throughout the music to fit the major scale pattern. It is a shorthand for the scale in use.
Diatonic vs. Chromatic: Pitches that belong to the key signature's scale are called diatonic. Pitches that are altered with accidentals but are not in the key signature are called chromatic. The vast majority of pitches in a simple melody will be diatonic.
Aural and Visual Cues: To find the tonic, first use the key signature to determine the potential major key. Then, listen to or look at the music, paying special attention to the final note of the piece, which is almost always the tonic.
Data & Organization Tools
The relationship between major keys and their signatures is organized by the Circle of Fifths. The order of sharps and flats is always the same.
Order of Sharps: F, C, G, D, A, E, B
(Mnemonic: Fat Cats Go Down Alleys Eating Birds)
Order of Flats: B, E, A, D, G, C, F
(Mnemonic: BEAD, Greatest Common Factor)
A simple way to identify a major key from its signature:
Sharp Keys: The tonic is a half step above the last sharp in the signature.
Flat Keys: The tonic is the second-to-last flat in the signature. (The key of F major, with one flat, is an exception that must be memorized).
| Sharps | Major Key | Flats | Major Key |
|---|---|---|---|
| 0 | C major | 0 | C major |
| 1 (F#) | G major | 1 (Bb) | F major |
| 2 (F#, C#) | D major | 2 (Bb, Eb) | B-flat major |
| 3 (F#, C#, G#) | A major | 3 (Bb, Eb, Ab) | E-flat major |
| 4 (F#, C#, G#, D#) | E major | 4 (Bb, Eb, Ab, Db) | A-flat major |
| 5 (F#, C#, G#, D#, A#) | B major | 5 (Bb, Eb, Ab, Db, Gb) | D-flat major |
| 6 (F#, C#, G#, D#, A#, E#) | F-sharp major | 6 (Bb, Eb, Ab, Db, Gb, Cb) | G-flat major |
| 7 (F#, C#, G#, D#, A#, E#, B#) | C-sharp major | 7 (Bb, Eb, Ab, Db, Gb, Cb, Fb) | C-flat major |
Evidence Bank
Key: The central note (tonic) and scale that organize a piece of music. All other pitches are heard in relation to this center.
Key Signature: The set of sharps or flats written on the staff after the clef that indicates the diatonic pitches for a piece of music.
Tonic: The first scale degree (^1) of a diatonic scale. It is the tonal center and the note of final resolution.
Diatonic: Any pitch that belongs to the primary major (or minor) scale of a key. These are the notes indicated by the key signature.
Chromatic: A pitch that does not belong to the diatonic scale of the current key. It is typically marked with an accidental (sharp, flat, or natural).
Leading Tone: The seventh scale degree (^7) in a major key. It is located a half step below the tonic and has a strong melodic tendency to resolve upward to it.
Skill Snapshots
Tonal Hierarchy
Establishing Tonic: In a piece in E-flat major, a melody that ends on the pitch E-flat provides a strong sense of closure and confirms it as the tonic.
Dominant-Tonic Relationship: The melodic leap from B-flat (^5) down to E-flat (^1) in E-flat major is a powerful, key-defining gesture.
Leading Tone Resolution: The melodic movement from D-natural (^7) up to E-flat (^1) creates a compelling sense of arrival at the tonic.
Melodic Tendency
Leading Tone → Resolution: The leading tone (^7) feels unstable and creates an expectation that it will resolve up by half step to the tonic (^1).
Subdominant → Mediant: Scale degree ^4 often moves smoothly downward by step to ^3, a stable member of the tonic triad.
Supertonic → Tonic: Scale degree ^2 can resolve directly down by step to the tonic (^1), creating a gentle but clear sense of closure.
Melodic Structure
Baseline Phrase: A simple melody in D major will use the pitches indicated by its two-sharp key signature and will almost certainly end on the pitch D.
Contrast: A phrase in D major that ends on A (^5) will sound unfinished, creating anticipation for a following phrase that resolves to D.
Continuity: The consistent use of only diatonic pitches throughout a passage strongly reinforces the established key. The introduction of a chromatic pitch creates a moment of special interest.
Common Misconceptions & Clarifications
Confusing the last sharp with the tonic. The last sharp in a key signature is the leading tone (^7), not the tonic. The tonic is a half step above the last sharp.
Assuming the first note of a melody is the tonic. The first note can be any scale degree. The final note of a melody is a much more reliable indicator of the tonic.
Writing key signatures incorrectly. The order of sharps and flats (FCGDAEB / BEADGCF) and their specific placement on the lines and spaces of the staff are standardized and must be followed precisely.
Forgetting the "no-signature" key. C major has no sharps and no flats. An empty key signature indicates the key of C major (or its relative, a minor).
Misidentifying the key of F major. For flat keys, the tonic is the second-to-last flat. Because F major has only one flat (B-flat), this rule doesn't apply and it must be memorized.
Summary
A key provides the gravitational center for a piece of music, with the tonic serving as the point of maximum stability and rest. The major scale is a primary source for the collection of pitches used in a major key. This collection of seven diatonic pitches is efficiently represented by a key signature, which alters specific notes throughout the piece. By reading the key signature, one can immediately determine the tonic and the set of notes that will form the melodic and harmonic foundation. The relationships between these pitches—especially the powerful tendency of the leading tone (^7) to resolve to the tonic (^1)—create the sense of motion and arrival that defines tonal music. Accurately identifying these relationships is the foundation for both music analysis and aural skills like melodic dictation.