What's a scale, anyway?
A scale is an ordered sequence of pitches between a starting note and its octave. Most have seven notes; some have five (pentatonic), six (whole-tone), or eight (octatonic).
Every scale is defined by its interval pattern — the gaps between consecutive notes, measured in semitones (the smallest step on a piano).
Apply the major scale's interval pattern starting on any note and you have that note's major scale. C major hits the white keys; G major needs an F♯; D major needs F♯ and C♯; and so on round the circle of fifths.
Modes are the same pattern played from a different starting note. Start the major-scale pattern from the second note instead of the first and you get Dorian; from the third, Phrygian; and so on. Each mode has a distinctive mood because it places half-steps in different positions relative to the tonic.
From there you branch into:
- Minor scales — natural, harmonic, melodic, each varying which notes are flattened or raised.
- Pentatonic / blues scales — five- and six-note subsets used in folk, blues, rock, and jazz.
- Symmetric scales — chromatic, whole-tone, diminished, augmented — where intervals repeat regularly.
- Jazz / modal-jazz scales — bebop, altered, Lydian dominant — the colourful vocabulary of post-1940s jazz.
- World-music scales — Hungarian, Persian, Japanese pentatonics — outside the Western classical mainstream.
Browsing the catalogue above is the fastest way to internalise them. Pick a tonic, pick a type, see the notation, hear it played.