key signature
E♭ major
E♭1F2G3A♭4B♭5C6D7
3 flats, written B♭ E♭ A♭
The chords that live in it
E♭degree 1 · majorFmdegree 2 · minorGmdegree 3 · minorA♭degree 4 · majorB♭degree 5 · majorCmdegree 6 · minorDdimdegree 7 · diminished
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
E♭ major has 3 flats.
They are written in this order, always: B♭ E♭ A♭.
Its notes are E♭, F, G, A♭, B♭, C and D.
Relative: C minor has the same 3 flats. Parallel: E♭ minor has 6 flats, which is why changing mode changes the signature by three.
Every key
C♭ majorG♭ majorD♭ majorA♭ majorB♭ majorF majorC majorG majorD majorA majorE majorB majorF♯ majorC♯ majorA♭ minorE♭ minorB♭ minorF minorC minorG minorD minorA minorE minorB minorF♯ minorC♯ minorG♯ minorD♯ minorA♯ minor