An octave is an interval of 12 half-steps.
The 12 half-steps on a single string is equal to 12 frets. For example, notes on the open strings have their octaves 12 frets higher at the 12th fret.
There are a few ways that you can go about finding an octave on a higher fret after you skip a string. You could go two strings up and two frets up, for starters.
The two examples here would be moving from the E to the D string or the A to the G string.
Secondly, we can move two strings and three frets up as well.
The two examples would be moving from the D to the B string or the G to the E string.
The NANDI Method looks at finding octaves on both higher and lower frets.
To accomplish this, we must first have an understanding of the relationship that exists between notes on strings that are either 2, 3, or 4 strings apart. We will start by taking the open notes E-A-D-G-B-E and grouping them together according to the distance in pitch: major seconds, major sixths, minor thirds and minor sevenths.
For example, the notes on the same frets on the A to B strings and the D to E strings are a major second apart.
The notes on the same frets on the E to G strings are a minor third apart.
The notes on the same frets on the D to B strings and G to E strings are a major sixth apart.
The notes on the same frets on the E to D strings and A to G strings are a minor seventh apart.
Let’s start off with figuring out the octave from the root on the E string. If we have our root 1 on the E string, all we have to do is skip a string to find the ♭7, which is found on the same fret of the D string.
The reason for this is that there is a minor seventh relationship between the two strings. If you move up two frets from that ♭7, you will find the octave or the 1.
The E-G strings are a minor third apart. The notes found on the same frets of those strings are a minor third apart too. If the 1 is on the E string, then you will find a ♭3 on the G string. Move down three frets from the ♭3 and you will find the 1 or the octave.
The D-B strings and G-E strings are a major sixth apart. The notes that are on the same frets on those strings can be found a major sixth apart. If we have a 1 on the D string, we will find a 6 on the B string. You can move up three frets from the 6 to find the 1 or the octave.
The same thing goes if you are looking at the G-E string set.
If we look at the A-B strings, we will see that the notes found on these strings are a major second apart. If the 1 is on the A string, we will find the 2 on the B string. Move down two frets from the 2 to get to the 1 or the octave.
The same thing goes if you are looking at the D-E string set.
