Tool
The harmonic field of B♭ major 2 flats in the key signature. Click a degree to hear it, or hear the whole field.
Triads B ♭ I Tonic Diatonic C m ii Subdominant Diatonic D m iii Tonic Diatonic E ♭ IV Subdominant Diatonic F V Dominant Diatonic G m vi Tonic Diatonic A dim vii° Dominant Diatonic
Hear the field Degree Symbol Notes Function I B ♭ B♭ · D · F Tonic ii C m C · E♭ · G Subdominant iii D m D · F · A Tonic IV E ♭ E♭ · G · B♭ Subdominant V F F · A · C Dominant vi G m G · B♭ · D Tonic vii° A dim A · C · E♭ Dominant
Seventh chords B ♭ maj7 Imaj7 Tonic Diatonic C m7 ii7 Subdominant Diatonic D m7 iii7 Tonic Diatonic E ♭ maj7 IVmaj7 Subdominant Diatonic F 7 V7 Dominant Diatonic G m7 vi7 Tonic Diatonic A m7 ♭5 viiø7 Dominant Diatonic
Hear the field Degree Symbol Notes Function Imaj7 B ♭ maj7 B♭ · D · F · A Tonic ii7 C m7 C · E♭ · G · B♭ Subdominant iii7 D m7 D · F · A · C Tonic IVmaj7 E ♭ maj7 E♭ · G · B♭ · D Subdominant V7 F 7 F · A · C · E♭ Dominant vi7 G m7 G · B♭ · D · F Tonic viiø7 A m7 ♭5 A · C · E♭ · G Dominant
The notes are spelled in octave 4, from B♭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.
Related keys G minor Relative: the same key signature, in the other mode. B♭ minor Parallel: the same tonic, in the other mode. B♭ 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.