What are major and minor scales, how are they built, and how do they give a piece its key and mood?
Build simple major and minor scales using tones and semitones, name the degrees of the scale, and explain how a key gives music a home note and a major or minor mood
A clear answer to the N(A)-Level Music outcome on scales and keys. Tones and semitones, building a major and a natural minor scale, the names of scale degrees, the home note (tonic), and how major sounds bright and minor sounds darker.
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What this dot point is asking
SEAB wants you to build simple major and minor scales using the right pattern of tones and semitones, to name the steps (degrees) of a scale, and to explain how a key gives a piece a home note and a major or minor mood. The big idea is that a scale is a ladder of notes built from a fixed pattern, and the key is simply which scale a piece feels at home in.
The answer
The building blocks: tones and semitones
A semitone (half step) is the smallest gap between two notes, for example from one piano key to the very next key, including the black keys. A tone (whole step) is two semitones. On the piano, most white-key neighbours are a tone apart, but E to F and B to C are only a semitone apart because there is no black key between them.
In KaTeX, a tone is two semitones: .
Building a major scale
A major scale uses this fixed pattern of steps from the home note upward:
Starting on C and following the pattern gives C, D, E, F, G, A, B, C, the white keys. The two semitones fall between degrees 3 and 4 (E to F) and between degrees 7 and 8 (B to C). Major scales sound bright and open.
Building a minor scale
A natural minor scale uses a different pattern:
Starting on A gives A, B, C, D, E, F, G, A, again the white keys, but now the mood is darker. The key difference from major is the third degree: minor has a lower (minor) third, which is what makes it sound sadder or more serious.
The degrees of the scale and the home note
Each step of the scale has a number and a name. The most important is degree 1, the tonic, which is the home note the music keeps returning to. Degree 4 is the subdominant, degree 5 is the dominant, and degree 7 is the leading note, which leans strongly up to the tonic.
What a key is
The key of a piece names its home note and whether it is major or minor, for example C major or A minor. A piece in a key uses mostly the notes of that scale and feels finished when it lands on the tonic. The sharps or flats needed for a key are shown at the start as the key signature.
Examples in context
Example 1. A bright national or school song. Many uplifting songs are in a major key, which is part of why they sound positive and open. Hearing the major third and the way the tune settles on the tonic helps you name the key by ear.
Example 2. A slow, sad ballad. A reflective or mournful song is often in a minor key, with its lowered third giving the darker colour. Comparing a major and a minor version of the same tune is the clearest way to feel what the key does.
Try this
Q1. Write the pattern of tones and semitones for a major scale. [2 marks]
- Cue. From the home note upward the pattern is T, T, S, T, T, T, S.
Q2. Name the home note of a scale and state its degree number. [2 marks]
- Cue. The home note is the tonic, and it is the first degree of the scale (degree 1).
Q3. Explain which scale degree decides whether a key sounds major or minor, and how. [3 marks]
- Cue. The third degree decides it: a major third above the tonic gives the bright major sound, while a lowered (minor) third gives the darker minor sound.
Exam-style practice questions
Practice questions written in the style of SEAB exam questions on this dot point, with worked answer explainers. The year tag is the paper they imitate, not the source.
Original6 marks(a) Write the pattern of tones (T) and semitones (S) used to build a major scale. (b) Starting on C and using only white piano keys, name the notes of the C major scale. (c) Explain in one sentence why the scale needs no sharps or flats.Show worked answer →
(a) The major scale pattern, from the home note upward, is T, T, S, T, T, T, S.
(b) Starting on C and applying the pattern on the piano gives C, D, E, F, G, A, B, C, which are all the white keys.
(c) The white keys already fall into the major pattern when you start on C, because the two natural semitones on the keyboard (E to F and B to C) land exactly where the major scale needs its two semitones, so no sharps or flats are needed.
What markers reward: the exact T T S T T T S pattern, the correct note names for C major, and a clear reason linking the natural semitones (E-F and B-C) to the scale pattern. A strong answer names where the two semitones fall in the scale (between degrees 3-4 and 7-8).
Original5 marksTwo short tunes use the same notes but one is in a major key and one is in a minor key, and they sound quite different in mood. (a) Describe the usual difference in mood between major and minor. (b) State which scale degree is most responsible for the change. (c) Name the home note of a scale and the degree number it has.Show worked answer →
(a) Major usually sounds bright, happy or open, while minor usually sounds darker, sadder or more serious.
(b) The third degree of the scale is most responsible: a major third above the home note gives the major sound, and a lowered (minor) third gives the minor sound.
(c) The home note is called the tonic, and it is the first degree of the scale (degree 1).
What markers reward: a sensible description of the major versus minor mood, correctly pointing to the third degree as the key difference, and naming the tonic as degree 1. The strongest answers note that it is the size of the third (major or minor) that flips the mood.
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