What a piano scale describes
A scale orders notes around a tonic. Use the explorer to compare spelling, direction, scale degrees, keyboard positions and generated sound.
A scale is an ordered pitch collection organised around a tonic. Degree names explain each note’s position; a step pattern explains semitone movement; spelling preserves the letter role; and an octave repeats the tonic at a higher or lower register. The keyboard and text answer show the same collection in complementary ways.
Tonic, degree and octave
The tonic is degree 1 and the reference point for the scale name. Degrees 2 through 7 identify positions within a heptatonic scale, while the octave returns to the tonic pitch class after twelve semitones. Pentatonic collections select five parent degrees rather than renumbering five consecutive letters.
Changing tonic transposes the collection. Changing scale type changes the interval pattern around a tonic. Keep one of those variables fixed when comparing outputs so the reason for each altered note remains visible.
Whole steps and half steps
One half step is the distance to the adjacent piano key; one whole step is two half steps. Major uses W–W–H–W–W–W–H. Natural minor uses W–H–W–W–H–W–W. The total returns to the octave, but the location of the half steps shapes each collection.
On D major, W–W–H produces D–E–F♯–G. The remaining steps produce A–B–C♯–D. Letter order and interval distance agree; calling F♯ G♭ would break the degree-three spelling.
Supported scale families
Major provides the familiar seven-degree reference. Natural minor lowers degrees 3, 6 and 7 relative to parallel major. Harmonic minor raises the natural-minor seventh. Classical melodic minor raises 6 and 7 on ascent and commonly returns through natural minor on descent.
Major pentatonic selects 1, 2, 3, 5 and 6; minor pentatonic selects 1, ♭3, 4, 5 and ♭7. Chromatic includes every semitone and uses an explicitly labelled directional spelling convention rather than claiming one diatonic letter rule.
- major: 1–2–3–4–5–6–7; W–W–H–W–W–W–H
- natural minor: 1–2–♭3–4–5–♭6–♭7; W–H–W–W–H–W–W
- harmonic minor: 1–2–♭3–4–5–♭6–7; W–H–W–W–H–A2–H
- melodic minor ascending: 1–2–♭3–4–5–6–7; W–H–W–W–W–W–H
- chromatic: twelve pitch classes; twelve semitone steps
- major pentatonic: 1–2–3–5–6; W–W–m3–W–m3
- minor pentatonic: 1–♭3–4–5–♭7; m3–W–W–m3–W
Major, minor and pentatonic comparisons
C major and A natural minor share notes but orient them around different tonics. C major and C natural minor share tonic but differ at E/E♭, A/A♭ and B/B♭. C major pentatonic omits F and B; A minor pentatonic uses the same pitch collection but gives A the tonic role.
These comparisons separate relative, parallel and shared-pitch relationships. A matching keyboard set does not erase the different tonic, degree labels or harmonic destination.
Key-aware spelling
Seven-note diatonic scales normally use each letter once. F♯ major therefore includes E♯, not F natural, because degree seven must be an E letter and sit one semitone below the tonic. Pentatonic pages use explicit omitted-degree maps so the missing parent letters stay missing.
The isolated keyboard’s sharp/flat preference is not reused as a theory algorithm. The selected root, scale type and direction provide the spelling context.
From a scale to chords
Take alternate spelled degrees to create triads: 1–3–5, 2–4–6 and so forth. C major yields C, Dm, Em, F, G, Am and B diminished. Adding another alternate degree creates diatonic seventh chords.
This relationship connects tonic, signature, chords-in-key and circle pages. Compare the scale notes with each chord to see how the stacked degrees create the harmony.
A practical reference workflow
Choose a tonic and scale type, predict the letters, then reveal the keyboard and text result. Toggle degree labels, compare the signature where applicable and follow the diatonic-chord link. Use generated audio only after the written structure is clear.
Repeat on a flat tonic and a sharp tonic. Finish with a pentatonic or chromatic example to check that the interface labels its non-heptatonic convention rather than applying the seven-letter rule blindly.
- Predict D major and name both sharps.
- Compare A natural, harmonic and melodic minor.
- Spell F♯ major pentatonic by parent degrees.
- Display a descending chromatic convention and state its limitation.
Compare scales by one change
Keep the tonic fixed while moving between major, natural minor, harmonic minor and melodic minor. This reveals exactly which degrees change. Then keep the scale type fixed and choose a new tonic to hear and see a transposition of the same interval pattern.
Write the expected letters before opening the answer. If a note looks surprising, count its scale degree and letter name before judging it by keyboard position alone.
Print and compare
The print centre provides a clean version of the selected notes, formulas and labels. Use the interactive explorer when you want to change the tonic, scale type or direction.