Nashville Number System — Key of Bb
The complete NNS chart for Bb Major: all seven diatonic chords with Nashville numbers and Roman numerals.
Key
Nashville Number Chart — Key of Bb
| Degree | Nashville | Chord |
|---|---|---|
| 1 | 1 | Bb |
| 2 | 2m | Cm |
| 3 | 3m | Dm |
| 4 | 4 | Eb |
| 5 | 5 | F |
| 6 | 6m | Gm |
| 7 | 7dim | Adim |
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Non-diatonic chords are preserved unchanged.
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Nashville Numbers in the Key of Bb Major
In the key of Bb Major, the seven diatonic chords are Bb, Cm, Dm, Eb, F, Gm, Adim. In Nashville Number System notation, these chords are numbered by their scale degree: the tonic chord Bb is 1, the subdominant Eb is 4, and the dominant F is 5. Minor chords use a lowercase “m” suffix — Cm is 2m, Dm is 3m, and Gm is 6m. The diminished seventh degree, Adim, is written 7dim.
NNS Reference Chart — Bb Major
Common Progressions in Bb Major — NNS Notation
The most common chord progression in Bb Major is I–V–vi–IV — Bb, F, Gm, Eb — written in Nashville notation as 1–5–6m–4. Because the NNS uses numbers rather than chord names, this chart works verbatim in any key — a band calling out “1, 5, 6m, 4” knows exactly what to play regardless of the root key. Cross-reference with our chords in the key of Bb Major for the full diatonic chord set with Roman numeral analysis.
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