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→Whole-Half Patterns
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This is powerful stuff. Each w/h pattern occurs in at least pairs of adjacent strings. If we know the 3 notes in our key on a single string, we know the string either above or below will have the same pattern. '''Ascending, we know that the w/h patterns go in this order: 3 w-w, 2 h-w, 2 w-h, then repeat.''' When we change from w-w to h-w, we shift our index finger placement upwards 1 fret.
If we know the patterns for 2 adjacent strings, in all but 2 cases, we can derive all the patterns. For example, if we know this:
|-|-|-|-|-|
|-|-|-|-|-|
|-|-|-|-|-|
|o|-|o|o|-|
|o|o|-|o|-|
|-|-|-|-|-|
Then we can derive this:
|x|-|o|-|o| After 2 w-h strings, we have 3 w-w strings
|o|-|o|-|o| After 2 w-h strings, we have 3 w-w strings
|o|-|o|o|-| Each string must have an adjacent string with the same pattern
|o|-|o|x|-| We know the leading tone is the only note without a P4 below - the next note must be the tonic
|o|o|-|o|-|
|o|x|-|o|-| Each string must have an adjacent string with the same pattern
Now, this is assuming we are still using all strings tuned to P4's. For the actual guitar tuning, we have to move that 2nd string upwards one fret, which also moves the 1st string:
|-|x|-|o|-|o| After 2 w-h strings, we have 3 w-w strings
|-|o|-|o|-|o| After 2 w-h strings, we have 3 w-w strings + 2nd/3rd string shift
|o|-|o|o|-| Each string must have an adjacent string with the same pattern
|o|-|o|x|-| We know the leading tone is the only note without a P4 below - the next note must be the tonic
|o|o|-|o|-|
|o|x|-|o|-| Each string must have an adjacent string with the same pattern
Now, if we want to restrict ourselves to 1 position, we need to move those high fret notes to the next string:
|*|x|-|o|-|!|
|-|o|-|o|-|*|
|o|-|o|o|-|
|o|-|o|x|-|
|o|o|-|o|-|
|o|x|-|o|-|
The * note moves up, but the ! note gets lopped off - there is no higher string to move to.
== 3 Notes Per String ==