Tool
The harmonic field of C major No accidentals in the key signature. Click a degree to hear it, or hear the whole field.
Triads C I Tonic Diatonic D m ii Subdominant Diatonic E m iii Tonic Diatonic F IV Subdominant Diatonic G V Dominant Diatonic A m vi Tonic Diatonic B dim vii° Dominant Diatonic
Hear the field Degree Symbol Notes Function I C C · E · G Tonic ii D m D · F · A Subdominant iii E m E · G · B Tonic IV F F · A · C Subdominant V G G · B · D Dominant vi A m A · C · E Tonic vii° B dim B · D · F Dominant
Seventh chords C maj7 Imaj7 Tonic Diatonic D m7 ii7 Subdominant Diatonic E m7 iii7 Tonic Diatonic F maj7 IVmaj7 Subdominant Diatonic G 7 V7 Dominant Diatonic A m7 vi7 Tonic Diatonic B m7 ♭5 viiø7 Dominant Diatonic
Hear the field Degree Symbol Notes Function Imaj7 C maj7 C · E · G · B Tonic ii7 D m7 D · F · A · C Subdominant iii7 E m7 E · G · B · D Tonic IVmaj7 F maj7 F · A · C · E Subdominant V7 G 7 G · B · D · F Dominant vi7 A m7 A · C · E · G Tonic viiø7 B m7 ♭5 B · D · F · A Dominant
The notes are spelled in octave 4, from C4. 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.
Related keys A minor Relative: the same key signature, in the other mode. C minor Parallel: the same tonic, in the other mode. C in the dictionary The tonic triad: notes, staff, keyboard and guitar shapes. Read about Diatonic harmony The chords that arise from stacking thirds on each degree of a scale, and why each quality lands where it does. Harmonic function The role each degree plays — tonic, subdominant, or dominant — and the tension that moves one to the next. Roman numeral analysis The notation that describes a chord by the position it occupies in the key rather than by the note it sits on. Minor key harmony The minor harmonic field, which is not one field: the three minor scales produce different chords on the same degree.