{"id":25,"date":"2025-09-29T00:41:41","date_gmt":"2025-09-29T00:41:41","guid":{"rendered":"https:\/\/apostolicmusic.site\/?page_id=25"},"modified":"2025-09-29T00:48:37","modified_gmt":"2025-09-29T00:48:37","slug":"nashville-number-system","status":"publish","type":"page","link":"https:\/\/apostolicmusic.site\/?page_id=25","title":{"rendered":"What is the Nashville Number System?"},"content":{"rendered":"\n

The Nashville Number System (NNS) writes chords as scale degrees instead of letter names. The number 1<\/strong> means the chord built on the key\u2019s 1st note (tonic), 4<\/strong> is the subdominant, 5<\/strong> is the dominant, etc. Because numbers are relative, the same chart works in any key\u2014just change the key center and keep the numbers.<\/p>\n\n\n\n

How to read NNS<\/h3>\n\n\n\n
    \n
  • 1\u20137<\/strong>: Diatonic scale degrees in the key (major by default for 1, 4, 5; minor for 2, 3, 6; 7 is diminished in major).<\/li>\n\n\n\n
  • Accidentals<\/strong>: #4<\/code> (sharp four), b7<\/code> (flat seven) for altered chords or borrowed tones.<\/li>\n\n\n\n
  • Quality<\/strong> (optional, when clarity is needed): 2m<\/code>, 5sus<\/code>, 1maj7<\/code>, 6m7<\/code>, 7\u00b0<\/code>.<\/li>\n\n\n\n
  • Slash bass<\/strong>: 1\/3<\/code> = tonic chord over the 3rd in the bass.<\/li>\n\n\n\n
  • Rhythm<\/strong> (often notated with symbols): diamonds (holds), pushes (arrows or carets), bars for measures.<\/li>\n<\/ul>\n\n\n\n

    Why NNS in Apostolic Pentecostal music?<\/h3>\n\n\n\n
      \n
    • Fast key changes<\/strong>: Worship leaders may jump keys for energy or vocal comfort\u2014numbers make on\u2011the\u2011fly modulations easy.<\/li>\n\n\n\n
    • Vamps and builds<\/strong>: Common I\u2013IV\u2013V vamps, 4\u21925 lifts, and turnarounds repeat seamlessly with numbers.<\/li>\n\n\n\n
    • Shouts\/Altars<\/strong>: Repetitive progressions (e.g., shout patterns) can loop indefinitely and modulate by whole\/half steps.<\/li>\n\n\n\n
    • Medleys<\/strong>: Chain songs without rewriting chords\u2014keep the same numeric flow in new keys.<\/li>\n<\/ul>\n\n\n\n

      Typical progressions you\u2019ll hear<\/h3>\n\n\n\n
        \n
      • Modern worship ballad<\/strong>: 1 \u2013 5 \u2013 6m \u2013 4<\/code><\/li>\n\n\n\n
      • Classic chorus<\/strong>: 1 \u2013 4 \u2013 1 \u2013 5<\/code><\/li>\n\n\n\n
      • Turnaround\/cadence<\/strong>: 4 \u2013 5 \u2013 1<\/code> or 2m \u2013 5 \u2013 1<\/code><\/li>\n\n\n\n
      • Drive\/Vamp<\/strong>: 1 \u2013 4 \u2013 5 \u2013 4<\/code> (loop) or 4 \u2192 5<\/code> build<\/li>\n\n\n\n
      • Shout pattern (one option)<\/strong>: 1 \u2013 #1\u00b07 \u2013 2m \u2013 5<\/code> (repeat)<\/li>\n\n\n\n
      • Bass walk (6 to 1)<\/strong>: 6m \u2013 5 \u2013 4 \u2013 5 \u2013 1<\/code><\/li>\n<\/ul>\n\n\n\n

        Examples in keys:<\/p>\n\n\n\n

        \n\/\/ Key of G:  1\u20135\u20136m\u20134   =>  G - D - Em - C\n\/\/ Key of Db: 4\u20135\u20131      =>  Gb - Ab - Db\n\/\/ Key of A:  2m\u20135\u20131     =>  Bm - E - A\n\/\/ Key of Bb: 1\u2013#1\u00b07\u20132m\u20135 => Bb - B\u00b07 - Cm - F\n  <\/code><\/pre>\n\n\n\n
        Quick translator (numbers \u2192 chords)<\/h3>\n\n\n\n
        Use this small script to turn a number chart into letter chords in any major key.<\/p>\n\n\n\n
        &lt;script&gt;\n\/\/ Major scale spelling with diatonic chord qualities\nconst MAJOR = {\n  C:  [\"C\",\"D\",\"E\",\"F\",\"G\",\"A\",\"B\"],\n  G:  [\"G\",\"A\",\"B\",\"C\",\"D\",\"E\",\"F#\"],\n  D:  [\"D\",\"E\",\"F#\",\"G\",\"A\",\"B\",\"C#\"],\n  A:  [\"A\",\"B\",\"C#\",\"D\",\"E\",\"F#\",\"G#\"],\n  E:  [\"E\",\"F#\",\"G#\",\"A\",\"B\",\"C#\",\"D#\"],\n  B:  [\"B\",\"C#\",\"D#\",\"E\",\"F#\",\"G#\",\"A#\"],\n  \"F#\":[\"F#\",\"G#\",\"A#\",\"B\",\"C#\",\"D#\",\"E#\"],\n  \"C#\":[\"C#\",\"D#\",\"E#\",\"F#\",\"G#\",\"A#\",\"B#\"],\n  F:  [\"F\",\"G\",\"A\",\"Bb\",\"C\",\"D\",\"E\"],\n  Bb: [\"Bb\",\"C\",\"D\",\"Eb\",\"F\",\"G\",\"A\"],\n  Eb: [\"Eb\",\"F\",\"G\",\"Ab\",\"Bb\",\"C\",\"D\"],\n  Ab: [\"Ab\",\"Bb\",\"C\",\"Db\",\"Eb\",\"F\",\"G\"],\n  Db: [\"Db\",\"Eb\",\"F\",\"Gb\",\"Ab\",\"Bb\",\"C\"],\n  Gb: [\"Gb\",\"Ab\",\"Bb\",\"Cb\",\"Db\",\"Eb\",\"F\"]\n};\nconst QUAL = [\"maj\",\"min\",\"min\",\"maj\",\"maj\",\"min\",\"dim\"]; \/\/ I ii iii IV V vi vii\u00b0\n\nfunction nnsToChords(key, numbers) {\n  const scale = MAJOR[key];\n  if (!scale) throw new Error(\"Unsupported key: \" + key);\n  return numbers.map(n => {\n    \/\/ parse items like \"6m7\", \"#4\", \"1\/3\", \"5sus4\", \"7\u00b0\"\n    const m = String(n).trim().match(\/^([#b]?)(\\d)([^\/]*)(?:\\\/([#b]?\\d))?$\/);\n    if (!m) return n; \/\/ return as-is if not matched\n    const [, acc, degStr, ext, bassAccDeg] = m;\n    let deg = parseInt(degStr, 10);\n    \/\/ base diatonic note\n    let note = scale[(deg - 1) % 7];\n\n    \/\/ apply accidental to root if present (# or b on the number)\n    const sharp = s => s.replace(\/([A-G])b?$\/, (m)=> m + \"#\");\n    const flat  = s => s.replace(\/([A-G])#?$\/, (m)=> m + \"b\");\n    if (acc === \"#\") note = note.includes(\"b\") ? note.replace(\"b\",\"\") : note + \"#\";\n    if (acc === \"b\") note = note.includes(\"#\") ? note.replace(\"#\",\"\") : note + \"b\";\n\n    \/\/ default quality if none specified and ext doesn't override:\n    let qual = ext || \"\";\n    if (!ext) {\n      const q = QUAL[deg - 1];\n      qual = q === \"maj\" ? \"\" : q === \"min\" ? \"m\" : \"\u00b0\";\n    }\n\n    \/\/ handle slash bass like 1\/3\n    let bass = \"\";\n    if (bassAccDeg) {\n      const acc2 = bassAccDeg[0] === \"#\" || bassAccDeg[0] === \"b\" ? bassAccDeg[0] : \"\";\n      const d2 = parseInt(acc2 ? bassAccDeg.slice(1) : bassAccDeg, 10);\n      let bassNote = scale[(d2 - 1) % 7];\n      if (acc2 === \"#\") bassNote = bassNote.includes(\"b\") ? bassNote.replace(\"b\",\"\") : bassNote + \"#\";\n      if (acc2 === \"b\") bassNote = bassNote.includes(\"#\") ? bassNote.replace(\"#\",\"\") : bassNote + \"b\";\n      bass = \" \/ \" + bassNote;\n    }\n    return note + qual + bass;\n  });\n}\n\n\/\/ Demo:\nconsole.log(nnsToChords(\"Ab\", [\"1\", \"5\", \"6m\", \"4\"]));     \/\/ [\"Ab\",\"Eb\",\"Fm\",\"Db\"]\nconsole.log(nnsToChords(\"Bb\", [\"1\",\"#1\u00b07\",\"2m\",\"5\"]));     \/\/ [\"Bb\",\"B\u00b07\",\"Cm\",\"F\"]\nconsole.log(nnsToChords(\"G\",  [\"1\/3\",\"4\",\"5sus\",\"1\"]));    \/\/ [\"G \/ B\",\"C\",\"Dsus\",\"G\"]\n&lt;\/script&gt;\n  <\/code><\/pre>\n\n\n\n
        Practical tips for your band<\/h3>\n\n\n\n
          \n
        • Agree on symbols<\/strong>: Decide as a team how you\u2019ll write minors (m), diminished (\u00b0), sus, extensions (7, 9), and pushes.<\/li>\n\n\n\n
        • Use numbers on the fly<\/strong>: When the leader says \u201cgo to 4, build to 5,\u201d everyone moves together regardless of key.<\/li>\n\n\n\n
        • Guitarists<\/strong>: Capo freely\u2014numbers keep the harmony aligned while voicings stay comfortable.<\/li>\n\n\n\n
        • Modulations<\/strong>: Step up by a whole\/half step\u2014keep the same numeric loop for shouts, vamps, and altar calls.<\/li>\n<\/ul>\n\n\n\n
          \n  
          What is the Nashville Number System?<\/h2>\n  
          \n    The Nashville Number System (NNS) writes chords as scale degrees instead of letter names.\n    The number 1<\/strong> means the chord built on the key\u2019s 1st note (tonic), 4<\/strong> is the subdominant, 5<\/strong> is the dominant, etc.\n    Because numbers are relative, the same chart works in any key\u2014just change the key center and keep the numbers.\n  <\/p>\n\n  
          How to read NNS<\/h3>\n  
            \n    
          • 1\u20137<\/strong>: Diatonic scale degrees in the key (major by default for 1, 4, 5; minor for 2, 3, 6; 7 is diminished in major).<\/li>\n    
          • Accidentals<\/strong>: #4<\/code> (sharp four), b7<\/code> (flat seven) for altered chords or borrowed tones.<\/li>\n    
          • Quality<\/strong> (optional, when clarity is needed): 2m<\/code>, 5sus<\/code>, 1maj7<\/code>, 6m7<\/code>, 7\u00b0<\/code>.<\/li>\n    
          • Slash bass<\/strong>: 1\/3<\/code> = tonic chord over the 3rd in the bass.<\/li>\n    
          • Rhythm<\/strong> (often notated with symbols): diamonds (holds), pushes (arrows or carets), bars for measures.<\/li>\n  <\/ul>\n\n  
            Why NNS in Apostolic Pentecostal music?<\/h3>\n  
              \n    
            • Fast key changes<\/strong>: Worship leaders may jump keys for energy or vocal comfort\u2014numbers make on\u2011the\u2011fly modulations easy.<\/li>\n    
            • Vamps and builds<\/strong>: Common I\u2013IV\u2013V vamps, 4\u21925 lifts, and turnarounds repeat seamlessly with numbers.<\/li>\n    
            • Shouts\/Altars<\/strong>: Repetitive progressions (e.g., shout patterns) can loop indefinitely and modulate by whole\/half steps.<\/li>\n    
            • Medleys<\/strong>: Chain songs without rewriting chords\u2014keep the same numeric flow in new keys.<\/li>\n  <\/ul>\n\n  
              Typical progressions you\u2019ll hear<\/h3>\n  
                \n    
              • Modern worship ballad<\/strong>: 1 \u2013 5 \u2013 6m \u2013 4<\/code><\/li>\n    
              • Classic chorus<\/strong>: 1 \u2013 4 \u2013 1 \u2013 5<\/code><\/li>\n    
              • Turnaround\/cadence<\/strong>: 4 \u2013 5 \u2013 1<\/code> or 2m \u2013 5 \u2013 1<\/code><\/li>\n    
              • Drive\/Vamp<\/strong>: 1 \u2013 4 \u2013 5 \u2013 4<\/code> (loop) or 4 \u2192 5<\/code> build<\/li>\n    
              • Shout pattern (one option)<\/strong>: 1 \u2013 #1\u00b07 \u2013 2m \u2013 5<\/code> (repeat)<\/li>\n    
              • Bass walk (6 to 1)<\/strong>: 6m \u2013 5 \u2013 4 \u2013 5 \u2013 1<\/code><\/li>\n  <\/ul>\n\n  
                \n    Examples in keys:\n  <\/p>\n  
                \n\/\/ Key of G:  1\u20135\u20136m\u20134   =>  G - D - Em - C\n\/\/ Key of Db: 4\u20135\u20131      =>  Gb - Ab - Db\n\/\/ Key of A:  2m\u20135\u20131     =>  Bm - E - A\n\/\/ Key of Bb: 1\u2013#1\u00b07\u20132m\u20135 => Bb - B\u00b07 - Cm - F\n  <\/code><\/pre>\n\n  
                Quick translator (numbers \u2192 chords)<\/h3>\n  
                Use this small script to turn a number chart into letter chords in any major key.<\/p>\n  
                <script>\n\/\/ Major scale spelling with diatonic chord qualities\nconst MAJOR = {\n  C:  [\"C\",\"D\",\"E\",\"F\",\"G\",\"A\",\"B\"],\n  G:  [\"G\",\"A\",\"B\",\"C\",\"D\",\"E\",\"F#\"],\n  D:  [\"D\",\"E\",\"F#\",\"G\",\"A\",\"B\",\"C#\"],\n  A:  [\"A\",\"B\",\"C#\",\"D\",\"E\",\"F#\",\"G#\"],\n  E:  [\"E\",\"F#\",\"G#\",\"A\",\"B\",\"C#\",\"D#\"],\n  B:  [\"B\",\"C#\",\"D#\",\"E\",\"F#\",\"G#\",\"A#\"],\n  \"F#\":[\"F#\",\"G#\",\"A#\",\"B\",\"C#\",\"D#\",\"E#\"],\n  \"C#\":[\"C#\",\"D#\",\"E#\",\"F#\",\"G#\",\"A#\",\"B#\"],\n  F:  [\"F\",\"G\",\"A\",\"Bb\",\"C\",\"D\",\"E\"],\n  Bb: [\"Bb\",\"C\",\"D\",\"Eb\",\"F\",\"G\",\"A\"],\n  Eb: [\"Eb\",\"F\",\"G\",\"Ab\",\"Bb\",\"C\",\"D\"],\n  Ab: [\"Ab\",\"Bb\",\"C\",\"Db\",\"Eb\",\"F\",\"G\"],\n  Db: [\"Db\",\"Eb\",\"F\",\"Gb\",\"Ab\",\"Bb\",\"C\"],\n  Gb: [\"Gb\",\"Ab\",\"Bb\",\"Cb\",\"Db\",\"Eb\",\"F\"]\n};\nconst QUAL = [\"maj\",\"min\",\"min\",\"maj\",\"maj\",\"min\",\"dim\"]; \/\/ I ii iii IV V vi vii\u00b0\n\nfunction nnsToChords(key, numbers) {\n  const scale = MAJOR[key];\n  if (!scale) throw new Error(\"Unsupported key: \" + key);\n  return numbers.map(n => {\n    \/\/ parse items like \"6m7\", \"#4\", \"1\/3\", \"5sus4\", \"7\u00b0\"\n    const m = String(n).trim().match(\/^([#b]?)(\\d)([^\/]*)(?:\\\/([#b]?\\d))?$\/);\n    if (!m) return n; \/\/ return as-is if not matched\n    const [, acc, degStr, ext, bassAccDeg] = m;\n    let deg = parseInt(degStr, 10);\n    \/\/ base diatonic note\n    let note = scale[(deg - 1) % 7];\n\n    \/\/ apply accidental to root if present (# or b on the number)\n    const sharp = s => s.replace(\/([A-G])b?$\/, (m)=> m + \"#\");\n    const flat  = s => s.replace(\/([A-G])#?$\/, (m)=> m + \"b\");\n    if (acc === \"#\") note = note.includes(\"b\") ? note.replace(\"b\",\"\") : note + \"#\";\n    if (acc === \"b\") note = note.includes(\"#\") ? note.replace(\"#\",\"\") : note + \"b\";\n\n    \/\/ default quality if none specified and ext doesn't override:\n    let qual = ext || \"\";\n    if (!ext) {\n      const q = QUAL[deg - 1];\n      qual = q === \"maj\" ? \"\" : q === \"min\" ? \"m\" : \"\u00b0\";\n    }\n\n    \/\/ handle slash bass like 1\/3\n    let bass = \"\";\n    if (bassAccDeg) {\n      const acc2 = bassAccDeg[0] === \"#\" || bassAccDeg[0] === \"b\" ? bassAccDeg[0] : \"\";\n      const d2 = parseInt(acc2 ? bassAccDeg.slice(1) : bassAccDeg, 10);\n      let bassNote = scale[(d2 - 1) % 7];\n      if (acc2 === \"#\") bassNote = bassNote.includes(\"b\") ? bassNote.replace(\"b\",\"\") : bassNote + \"#\";\n      if (acc2 === \"b\") bassNote = bassNote.includes(\"#\") ? bassNote.replace(\"#\",\"\") : bassNote + \"b\";\n      bass = \" \/ \" + bassNote;\n    }\n    return note + qual + bass;\n  });\n}\n\n\/\/ Demo:\nconsole.log(nnsToChords(\"Ab\", [\"1\", \"5\", \"6m\", \"4\"]));     \/\/ [\"Ab\",\"Eb\",\"Fm\",\"Db\"]\nconsole.log(nnsToChords(\"Bb\", [\"1\",\"#1\u00b07\",\"2m\",\"5\"]));     \/\/ [\"Bb\",\"B\u00b07\",\"Cm\",\"F\"]\nconsole.log(nnsToChords(\"G\",  [\"1\/3\",\"4\",\"5sus\",\"1\"]));    \/\/ [\"G \/ B\",\"C\",\"Dsus\",\"G\"]\n<\/script>\n  <\/code><\/pre>\n\n  
                Practical tips for your band<\/h3>\n  
                  \n    
                • Agree on symbols<\/strong>: Decide as a team how you\u2019ll write minors (m), diminished (\u00b0), sus, extensions (7, 9), and pushes.<\/li>\n    
                • Use numbers on the fly<\/strong>: When the leader says \u201cgo to 4, build to 5,\u201d everyone moves together regardless of key.<\/li>\n    
                • Guitarists<\/strong>: Capo freely\u2014numbers keep the harmony aligned while voicings stay comfortable.<\/li>\n    
                • Modulations<\/strong>: Step up by a whole\/half step\u2014keep the same numeric loop for shouts, vamps, and altar calls.<\/li>\n  <\/ul>\n<\/section>\n\n\n\n\n<\/nns-trainer>\n\n\n