Read the signature · See the scale · Know the ledger notes
Level 1 — Key signatures. A clef and a key signature appear on the staff. The card names the major key and its relative minor, and lists the sharps or flats. The three signatures that have two common spellings (B / C♭, F♯ / G♭, C♯ / D♭) show both.
Level 2 — Major scale. The major (Ionian) scale of the key, written out across the staff.
Level 3 — Natural minor scale. The natural minor (Aeolian) scale of the relative minor — the same signature, no raised leading tone.
Scales are filled edge to edge across a fixed window so two ledger lines appear above and below the staff on every card — treble runs A3→C6, bass runs C2→E4. Every note is labeled with its name so the ledger-line notes become familiar by sight. Gold labels mark the ledger-line notes; the colored noteheads mark the tonic (the "home" note of the scale).
Learn shows the answer with the card. Quiz (Level 1 only for now) hides the names — read the signature, pick the key, and the card tells you if you were right. Either spelling of an enharmonic signature counts.
Clef picks treble, bass, or a random clef per card. Order sets the deck sequence. Play plays the scale aloud in its written octaves; the audio toggle silences it for shared or late-night practice.
← / → previous / next card · Space play scale · R reveal (Quiz)
The key signature sits at the far left of every staff and quietly governs every note that follows. Reading it before the notes is the single habit that separates fluent readers from note-by-note decoders, which is why these cards put the signature front and center.
Every key signature belongs to two keys at once: a major key and its relative minor, a minor third below. They share the exact same sharps or flats — only the "home" note differs. That is why each card names both, and why Level 3 draws the relative minor from the very same signature you read in Level 1.
Three signatures can be written two ways that sound identical: B major (5 sharps) and C♭ major (7 flats); F♯ major and G♭ major (6 each); C♯ major (7 sharps) and D♭ major (5 flats). Both spellings are "correct" — which one a composer chooses depends on context.