Nashville Number System

The Nashville Number System is a short-form method of music transcription without using traditional staff notation.^[1]: 150 It features Arabic numbers rather than conventional note names on a staff. The numbers represent chords by scale degrees, thereby representing harmony in relation to a tonic note.^[2] It is similar to Roman numeral analysis and figured bass traditionally associated with music pedagogy, but differs in that it is primarily a practical notation designed for musical performance, adding rhythmic information, chord extensions, dynamics, and other parameters to be conveyed in a compact, key-independent format.^[2][3]

In the system, the tonic note of the song's key is designated as 1, with other numbers representing scale degrees relative to it. Thus, the chord progression C–F–G–C in the key of C is written 1–4–5–1. Because the numbers describe relationships within the key rather than fixed pitches, the same chart, if transposed to C♯–F♯–G♯–C♯ or any other key, is also written as 1–4–5–1. This assumes the initial key of the chart is known and agreed upon by all reading it, and the player knows the relative intervals based on the key designation.^[4]

It is intended primarily for a vocal group or rhythm section. Unlike a fully notated score, a Nashville Number System chart does not specify every note played by each musician. It is intended to provide the harmonic and structural framework while leaving performers to develop their individual parts, voicings, and other details.^[5] The system's flexibility in accommodating spontaneous key changes and arrangement variations contributed to its usefulness in studio recording.^[6] The system was developed in Nashville, Tennessee in the late 1950s by session musicians Neal Matthews Jr. and Charlie McCoy as a shorthand to provide rapid transcription of new songs during recording sessions and facilitate transposing them to different keys.^[4]

In major recording centers such as New York in the 1950s, recording sessions were typically based on arrangements prepared in advance. An arranger developed the song from a demo recording and wrote individual parts for the musicians, who came to the studio and performed the parts as written, with little or no embellishment or alteration. Responsibility for the resulting product rested almost entirely on the arranger.^[7]

Producer Billy Sherrill later contrasted this approach with Nashville recording, observing that changes to a fully written arrangement could be costly and time-consuming.^[8] In a 1973 interview in Time Magazine Sherrill said, " In New York, you start to change something, you tear up a $700,000 arrangement."

A different working method existed in Nashville and other Southern recording centers, including Muscle Shoals. Rather than relying on complete arrangements prepared beforehand, session musicians often worked out an arrangement collectively in the studio. A demo recording might be played once or twice, after which the musicians developed their parts by ear under the leadership of the producer.^[9] In Nashville this practice became known as a "head session", in which musicians memorized the song and developed the arrangement during the session itself.^[8] What the musicians discovered was a way to capture an arrangement almost as quickly as it developed, with a premium on speed, accuracy, and the ability to respond to changes. The Nashville number system could be used to jot the song down while listening to a demo, yet contain enough information to guide the session .^[5]

In the late 1950s, Neal Matthews Jr., a member and vocal arranger of the Jordanaires, developed this particular Nashville system initially for writing vocal parts using Arabic numerals for use by the group in recording sessions.^[10][11] The Country Music Hall of Fame and Museum credits Matthews with popularizing the system.^[10] In the early 1960s, Nashville session musician Charlie McCoy adapted Matthews's numerical approach to chart chords for bass, drums, piano, and guitar. Its flexibility in accommodating spontaneous arrangement changes and changes of key contributed to its usefulness in studio recording.^[6]

According to Chas Williams's history of the system, Matthews drew on his familiarity with shape-note notation, which had long been used by gospel quartets and assigned distinctive shapes to the notes of the scale.^[5]: 6 Because the Jordanaires often worked several recording sessions a day, Matthews sought a way to write vocal parts quickly rather than rely on memorization. He began replacing the shape-note symbols with numbers and developed a numerical notation for the group's vocal arrangements.^[5]

The Nashville numbering system provided us the shorthand that we needed so that we could depend on our ears rather than a written arrangement. It took far less time to jot the chords, and once you had the chart written, it applied to any key. The beauty of the system is that we don't have to read. We don't get locked into an arrangement that we may feel is not as good as one we can improvise.

The use of syllables or numbers to represent musical relationships long predates the Nashville Number System.^[5] In Western music, solmization developed during the Middle Ages as a method of teaching pitch relationships. In the 11th century, Guido of Arezzo introduced the syllables ut, re, mi, fa, sol, and la as an aid to teaching singers.^[13] The practice later developed into solfège, which in English-speaking countries commonly uses the seven syllables do, re, mi, fa, sol, la, and ti.

Numbered systems for representing musical notes appeared in Europe by the late 17th century and were further developed in the 18th century by Jean-Jacques Rousseau, who proposed representing the seven degrees of the diatonic scale with the numbers 1 through 7.^[14] In 19th-century France, the Galin-Paris-Chevé system further developed numbered notation, particularly for music education and sight-reading.^[14]

These earlier numbered systems primarily use numbers to represent individual notes or scale degrees. The Nashville Number System instead uses numbers primarily to represent chords, according to their relationship to the tonic. In this respect it resembles Roman numeral analysis, in which chords are likewise identified by scale degree rather than by absolute pitch. The Nashville system, however, uses Arabic rather than Roman numerals and incorporates additional symbols and conventions suited to the practical requirements of popular-music performance and recording.^[2]

The system represents chords by their scale degree relative to the tonic, using Arabic numerals rather than chord letters. Thus, in the key of C major, the C, F, and G chords are represented by 1, 4, and 5; if the song is transposed to G major, the corresponding G, C, and D chords are still 1, 4, and 5. Because these numerical relationships remain unchanged when the key changes, a chart can ordinarily be transposed without being rewritten.^[2][5] The chart's key center (tonic note) must be correctly determined to make the number system accurate. The tonic establishes the reference point from which all chord numbers are assigned.^[4] In the example below, the key center is not the first chord; this song starts on the 4 chord.

All chords are considered as major chords (without applying diatonic theory) until chord qualities are applied.^[4] The chord qualities are designated with symbols commonly used in popular music chord notation such as sevenths, diminished, augmented, suspended, minor (usually indicated by a minus sign or m), and others.^[15][2]

Charts are commonly arranged in lines of four measures, with each measure containing one or more numbers representing its chords.^[16][17] When more than one chord occurs within a measure, the chords may be grouped by underlining or other markings (example below).^[2][11]

Nashville charts may also convey information needed in performance, including rhythm, chord duration, articulation, rests, anticipated chord changes ("pushes"), and changes in song form or arrangement.^[2] Common conventions include a diamond around a number to indicate a sustained chord, and, for a staccato chord, a marcato symbol or a dot. Rests are generally indicated by conventional notation, although some musicians use other markings.^[17]

The symbols and conventions are not completely standardized, and individual musicians may use different methods of notation.^[5] Chas Williams illustrates this variation by reproducing charts of the same song prepared independently by seven professional Nashville session musicians, allowing their individual practices to be compared.^[5]: 43

The number system has an exception to the chromatic rule— that is, when notes are ascending, sharps are written, and if descending, flats. The rule is typically ignored on 3b ("three flat") and the 7b ("seven flat"), because these have become such familiar harmonic concepts in popular music that have become conventional terms for chromatic roots measured from 1. They rarely if ever written as 2# and 6#.^[4]

The amount of information included in a chart varies with the needs of the arrangement. A chart may provide little more than a skeletal harmonic and structural framework, leaving performers to develop individual parts and voicings, or it may include detailed rhythmic and performance instructions. Traditional staff notation may also be incorporated on occasion when a particular melodic or rhythmic passage must be played as written (example below).^[2][5]

Despite the amount of information that may be included, the system's compact format can usually represent the functional harmony and structure of an entire song on a single page.^[2]

The accompanying chart of “After You've Gone”, a song transcribed by Nashville studio musician Bobby Ogdin, illustrates the Nashville notation's typical song form, tempo, chord-quality, time signature, alternate bass notes, articulation markings, "pushes" (anticipatory chords), and held chords. Because Nashville Number System notation is not completely standardized, some of the symbols reflect the individual transcriber's practice.

"After You've Gone" by Creamer and Layton, 1918.

• The first note is not always the tonic note—this example begins on the 4 chord.
• Δ indicates major 7th chord.
• Minus sign indicates minor chord.
• Underlining indicates a split measure.
• Boxed measure indicates complex measure. Hashmarks denote individual beats.
• 1/5 means the 1 chord with a 3 bass note.
• Final measure has a "push", (anticipated beat), and sustained chord.

• Chord chart § Nashville notation
• Nashville tuning
• Numbered musical notation

• Diamond on the 1 – a "gig bag book" by Nashville musician Jonathan Riggs that introduces the basic concepts of the Nashville Number System
• Interactive NNS chart
• Learn the Nashville Number System – information on rhythm notation is included in the Flash-based "Nashville Number System Quiz and Rhythm Tutorial". It also includes a separate Flash-based ear training quiz.
• Oral use example: "Ok.. it's a standard 12 bar in "G" but add a 2 on the bridge ...kick it off from the 5 ... hit the 4 on the way down, and then into the 1 ... watch me for the 2"
• The Nashville Number Fake Book by Trevor de Clercq – This book includes a detailed overview of the Nashville Number System as well as complete charts for 200 acclaimed country songs.
• The Nashville Number System – Site for the book Song Charting Made Easy: a Play-along Guide to the Nashville Number System by Jim Riley, with a preview including charts and play-along music tracks
• The Number Song – a chart with (auto-playing) audio explanation and playthrough by Jimi Whitelaw, Chip Hardy, Rod Lewis, and Tim Grogan of Nashville Demo Studio. Shows standard musical notation such as repeat signs, D.S. al coda, rhythmic notation, and staccato dots used in a Nashville Number System chart.