Tool

The harmonic field of E♭ major

3 flats in the key signature. Click a degree to hear it, or hear the whole field.

Triads

DegreeSymbolNotesFunction
IEE♭ · G · B♭Tonic
iiFmF · A♭ · CSubdominant
iiiGmG · B♭ · DTonic
IVAA♭ · C · E♭Subdominant
VBB♭ · D · FDominant
viCmC · E♭ · GTonic
vii°DdimD · F · A♭Dominant

Seventh chords

DegreeSymbolNotesFunction
Imaj7Emaj7E♭ · G · B♭ · DTonic
ii7Fm7F · A♭ · C · E♭Subdominant
iii7Gm7G · B♭ · D · FTonic
IVmaj7Amaj7A♭ · C · E♭ · GSubdominant
V7B7B♭ · D · F · A♭Dominant
vi7Cm7C · E♭ · G · B♭Tonic
viiø7Dm7♭5D · F · A♭ · CDominant

The notes are spelled in octave 4, from E♭4. The function is assigned by degree — tonic on I, III and VI; subdominant on II and IV; dominant on V and VII — which is how the harmonic field is taught. Context can change that reading, and the tool reports the degree.