Take the 2-minute tour ×
Musical Practice & Performance Stack Exchange is a question and answer site for musicians, students, and enthusiasts. It's 100% free, no registration required.

I was wondering why are the white dots in the fretboard usually placed in frets number 3,5,7,9,12,15,17,19 and 21.

I know that their general purpose is for counting, but what I wonder is why are they placed on precisely those frets, and not different ones (e.g. why is the difference between dots equal to two until 9, and then the next difference is 3?)

share|improve this question
    
I have guitars with a marker on the first fret as well ! Is that for the hard of thinking? –  Tim 4 hours ago
add comment

5 Answers

The spacing is designed to offer useful milestones on the fretboard. Take the notes on the 6th string (in standard tuning), for example:

  • Open (0th fret) is E.
  • The F is only 1 fret away, why put a marker on the 1st fret? It's already marked by being the first fret
  • The G is on fret 3, so put a marker there.
  • The A is on fret 5, which is a perfect 4th from the open string, so it deserves a marker.
  • B follows on fret 7, which is a perfect 5th from the open string, so another marked fret.
  • Why there's a mark on fret 9, I'll never know, I wish it was on 10 for D instead of 9 for C#
  • But you need a marker on 12, for certain - it's the octave!
  • The 15, 17, and 19 are just 3, 5, and 7 + 12 (an octave), respectively.
share|improve this answer
6  
"The A is on fret 5, so it deserves a marker" is p4th of the root. "B follows on fret 7, another marked fret" and is the p5th of the root. Quite important intervals. –  Anonymous Apr 4 '11 at 23:27
1  
I own a very old russian made guitar with the marker on the 10th fret. And boy, is it hard to play because of that, even though I usually don't watch the markers... –  mrbuxley Apr 5 '11 at 5:42
    
@ledfloyd - You're obviously much more of a theory guru than I am. Would you please edit this answer to include your insights? @mrbuxley - I wouldn't want to play that guitar now, either. I'm used to the 9th fret mark by now. I just wish it were the other way. However, ledfloyd's answer explains why it is where it is. –  gomad Apr 5 '11 at 17:48
1  
I'd guess that the 9th fret has a marker and not the 10th because the 9th fret is a member of the major scale while the 10th is not. But then, the same logic would put a marker on the second fret and not the third, so I don't know. –  Alex Basson Apr 5 '11 at 19:05
2  
Nice breakdown. With regards to the 9th fret, my suggestion would be that it marks the position of the relative minor to an open-string major scale. Having said that, however, I think the reason is more prosaic: the flanking two-fret intervals make the octave immediately stand out, even if the markers are bars or some such (i.e. no special double dot symbol or similar). The remaining seven frets are divided in the most efficient way for easy recognition: four marks, three spaces. –  Faza May 24 '11 at 9:08
show 2 more comments

Maybe lost to history, the dots are references for the Fibonacci series, which when harmonics are considered, give a pure major chord with octave and perfect fifth redundancies. The dot at the 9th fret marks 2/5ths the string length. The harmonic there is of the 5th partial (the major third) -- this is the one that throws you off.

This is my observation, and it is so easy once seen, that I have little doubt that many people have stumbled across it. Nonetheless, Gibson and Martin guitars had nothing to say about it, and so far as I could see, nothing to see in google searches. THE DOTS MARK THE HARMONICS COMPRISING A PURE MAJOR CHORD.

Are the dots an atavism from pre-equal tempered tuning? In historical paintings of fretted instruments, or in museums, when are the earliest dots seen in their modern location??

string
open = 1 = do
dots
12 = 2nd partial = do (octave over root)
7 = 3rd partial = sol (perfect 5th + octave over root)
5 = 4th partial = do (double octave over root)
9 = 5th partial = mi (double octave + major third over root)
3 = 6th partial = sol (double octave + perfect 5th over root)

share|improve this answer
add comment

I think it's to signify intervals as much as anything else. The 12th fret is the most obvious - it's the octave. The 3rd fret is pretty obvious because it gives you some general orientation for most open chords. The 5th and 7th frets are valuable because they signify the 4th and 5th interval of the open strings.

share|improve this answer
add comment

Ok, I found other way to explain the ninth fret. When I was starting learning music teacher have shown me solmization sounds (do, re, mi, fa, sol, si); which was most basic major scale; sounds in it are c, d, e ,f, g, a, b(in my country h). And I was thinking how I would mark fretboard if I did it by myself.

First string tuned to e. How to map any sound from these with rule: do not mark adjacent frets? The easiest way is to put a dot between c and d.

  • e - 0 fret
  • f - adjacent do not mark
  • g - first dot
  • a - second dot
  • b - third dot
  • c - adjacent do not mark
  • it is easy to remember that fourth dot is between c and d
  • d - adjacent do not mark
  • e - double dot octave
share|improve this answer
add comment

They are at important intervals: minor third, fourth, fifth, major sixth, octave.

Then they repeat for the second octave: minor third, fourth, fifth, major sixth.

share|improve this answer
add comment

Your Answer

 
discard

By posting your answer, you agree to the privacy policy and terms of service.