Lesson 10: Scales: Major and Minor

A scale is a set of notes arranged in order, from low to high and back down, that a piece of music is built from. Think of it as the alphabet of a piece: just as a sentence uses only the letters of the alphabet, a melody uses (mostly) only the notes of its scale. The two most important scales in Western music are the major scale and the minor scale, and the difference between them is the difference between a bright, sunny mood and a darker, sadder one.

The major scale follows a fixed pattern of tones (whole steps) and semitones (half steps): tone, tone, semitone, tone, tone, tone, semitone — often written T-T-S-T-T-T-S. In the key of C major, the pattern falls exactly on the white notes of the piano: C, D, E, F, G, A, B, C. There are no sharps or flats, because the piano's white notes already have semitones between E and F and between B and C, exactly where the pattern needs them. Start the same pattern on any other note and you must add sharps or flats to keep the pattern correct: G major, for example, needs F sharp, because the step from E to F sharp is a tone, while E to F natural would only be a semitone.

The Minor Scale

The natural minor scale has its own pattern: tone, semitone, tone, tone, semitone, tone, tone (T-S-T-T-S-T-T). In the key of A minor, it falls on the white notes: A, B, C, D, E, F, G, A. Notice something remarkable: A minor uses exactly the same notes as C major, just starting from a different place. Scales that share the same notes in this way are called relative major and minor — A minor is the relative minor of C major. The difference is which note feels like home: in C major, the music rests on C; in A minor, it rests on A. The semitones fall in different places (between the 2nd and 3rd notes in minor, and between the 3rd and 4th in major), and that small shift changes the whole mood.

Composers also use two other forms of the minor scale. The harmonic minor raises the 7th note by a semitone, which makes the final step to the tonic stronger and gives the scale its distinctive, slightly exotic leap between the 6th and 7th notes. The melodic minor raises both the 6th and 7th notes when ascending, smoothing out that leap, and usually returns to the natural minor form when descending. These are tools for melody writing, and you will meet them often in real pieces.

Why Scales Matter

Scales are not just theory exercises. Every melody you have ever hummed is built from a scale, every chord in a song is built from the notes of a scale, and every key signature is simply a record of which sharps or flats a scale needs. Practising scales trains the fingers and the ear at the same time: fingers learn the patterns, and the ear learns to expect the right notes. That is why scale practice is a daily habit for serious musicians on every instrument.

Scale Degrees and Modes

Each note of a scale has a name that describes its job. The first note is the tonic (home), the second the supertonic, the third the mediant, the fourth the subdominant, the fifth the dominant, the sixth the submediant, and the seventh the leading note — so called because it leads strongly up to the tonic. These names are used in every key, and they explain why chords built on certain notes behave the way they do: the dominant chord pulls home because the leading note inside it wants to resolve to the tonic. The major and minor scales are not the only scales built from the same seven notes. Start the C major scale on D instead of C and you get the Dorian mode; start it on G and you get the Mixolydian mode. Modes are simply the same notes with a different home, and each one has its own character: Dorian sounds serious and a little dark, Mixolydian sounds bright but relaxed, and the blues scale — a minor pentatonic scale with one extra "blue" note, the flattened fifth — is the sound of blues, rock and jazz solos. Learning modes is a natural next step after major and minor.