The chords that live in it
Amdegree 1 · minorBdimdegree 2 · diminishedCdegree 3 · majorDmdegree 4 · minorEmdegree 5 · minorFdegree 6 · majorGdegree 7 · major
Built by stacking thirds inside the scale and asking what quality comes out, rather than from a table of roman numerals.
What is true of it
A minor has no sharps and no flats.
It is the one key whose signature is empty, which is why every explanation of every other key starts here.
Its notes are A, B, C, D, E, F and G.
Relative: C major has the same no sharps and no flats. Parallel: A major has 3 sharps, which is why changing mode changes the signature by three.
Every key
C♭ majorG♭ majorD♭ majorA♭ majorE♭ majorB♭ majorF majorC majorG majorD majorA majorE majorB majorF♯ majorC♯ majorA♭ minorE♭ minorB♭ minorF minorC minorG minorD minorE minorB minorF♯ minorC♯ minorG♯ minorD♯ minorA♯ minor