Nashville Number System: how it works
Published on Friday 15 May 2026
As a musician, you’re of course familiar with staff notation or chord symbols. Two forms of music notation that make it possible to play songs straight from the page. But you may also have heard of a third form of notation: the Nashville Number System. Guest blogger and singer-songwriter Kevin Okkema explains exactly how it works.
What is the Nashville Number System?
The Nashville Number System originated in the late 1950s in the American studio scene. It was used as a simple form of music notation that session musicians could work with quickly. To this day, it’s still mainly used by session players. In the Nashville Number System, numbers take centre stage and there’s no need for traditional staff notation—so you’re unlikely to come across staves or treble clefs. The numbers are still tied to classical music theory, though, and refer to diatonic chords. How that works exactly… keep on reading 😉
How does the Nashville Number System work?
Let’s take the key of G major as an example. If you’re reasonably familiar with chords and music theory, then you may know that the diatonic chords in G major are: G – Am – Bm – C – D – Em – F#dim. “Diatonic chords” means you take the seven notes of the G major scale as your starting point, and then build a standard triad on each of those notes. The key thing is that these chords only contain notes that are already in the G major scale. So sometimes you’ll end up with a major chord, sometimes a minor chord, and sometimes a diminished chord. So far so good… right? The Nashville Number System then links numbers to these chords. The tonic—in this case G—becomes number 1. So the first chord (G major) is 1. Easy! The next chord (A minor) is 2. If we finish the whole sequence: Bm = 3, C = 4, D = 5, Em = 6, F#dim = 7. That’s all there is to it. So, if as a musician you’re handed a piece of paper that says 1 – 6 – 4 – 5 – 1 and you’re told the song is in G major, then you know you need to play G – Em – C – D – G.
What about minor keys?
As mentioned earlier, the numbers in the Nashville Number System correspond to diatonic chords. In the example above, we used chords that fall within the G major scale. But what about a minor scale? That’s very straightforward! Say we’re going to play something in A minor and on our sheet it says: 1 – 4 – 7 – 3. Then we play Am – Dm – G – C. That’s because the diatonic chords of A minor are: Am (1) – Bdim (2) – C (3) – Dm (4) – Em (5) – F (6) – G (7). The only thing you need to know in advance, then, is which chords belong to the given key.
Non-diatonic chords
Of course, it happens that a song uses chords that don’t necessarily fall within the agreed key. The Nashville Number System has a simple solution for that: you add a flat (b) or a sharp (#). In the key of C, an Eb would be b3. It’s also common, for example, for the F chord (4) in the key of C to be played not as major but as minor. That does need to be indicated, and you do that by writing an m after the number 4 (4m) or a – (4–). Major 7 chords are indicated with a Δ (4Δ), dominant 7 chords with a 7 (57), and half-diminished with ø (7ø). You probably already know these from standard chord symbols. Also similar to standard chord notation is writing alternate bass notes. For example, the chord C/E in the key of C major becomes 1/3 in Nashville notation.
Why use the Nashville Number System?
Now you might be thinking: “Nice… but why make it difficult when it can be easy? You could just write down the chord symbols directly.” And you could—and maybe you find that a lot nicer. But imagine you play in a covers band and, as a well-prepared musician, you’ve written out all the songs neatly using chord symbols so you can read along perfectly during gigs. It’s pretty annoying if the singer calls in sick one night and the stand-in singer wants to sing all the songs a semitone lower. Then you’ll have to transpose everything specially for that evening, leaving you with sheets full of scribbles. In that case, the Nashville Number System is ideal, because you don’t have to rewrite anything. The numbers are already there—you just agree on the new key beforehand. The intervals between the chords stay exactly the same. So if the notation for a song is 1 – 4 – 5 – 1 and you normally play it in C major (C – F – G – C), then 1 – 4 – 5 – 1 in B major (B – E – F# – B) will sound like the same progression. That’s precisely why session musicians used it back in the days: it made it quick and easy to adjust the music to suit the vocal range of whoever walked into the studio.
Advantages of the Nashville Number System
All in all, the Nashville Number System is designed to be very flexible. If the key of a song changes, you don’t need to rewrite anything, and you can work quickly as a musician. And of course—just like with chord symbols—you don’t need to be able to read music.
Disadvantages of the Nashville Number System
First of all, the system can be quite challenging for beginners. They’re very likely better off learning standard chord notation first. Otherwise, the Nashville Number System has much the same drawbacks as normal chord notation. Things like bar structure and timing aren’t written down, whereas that’s completely normal in standard staff notation. Most musicians who use the Nashville Number System will jot down a few notes at the top of the page to make these things clear. It’s also not exactly suitable for notating little licks or themes.
What works best for you?
Of course, as a musician you should use whichever music notation you find most comfortable. But if you’re active as a session musician and you need to be able to adapt quickly to changing circumstances, then the Nashville Number System is a great tool to work with—as long as your music theory knowledge is up to scratch.
Did my explanation help? Are you planning to use it yourself one day? And if you already work with it, what do you think? Leave a comment below!
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