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Les deux dernières CBG sorties tout juste de l'atelier.
Une 3 cordes équipée d'un micro 3 plots "Rola" de ma fabrication. La table est bombée et sculptée façon années 30.
Une 4 cordes équipée d'un micro Humbucker, la table est plate et sculptée façon années 30 également. Cette CBG est frettless.

As a novice getting the hang of playing any instrument, especially a CBG is very confusing. Playing the instrument in a Blues style is even more complicated if you do not understand its development. I have yet to find a good primer on blues. I am not an expert but the following appears to be valid from all I have read:

The major "D" for blues has a "D" for the I chord, and "F" for the iii,  a G for the IV, an "A" for the V, and a "C" for the vii. A minor D7 uses the notes of 1 = D, 5 = A, 3 = F, and 7 =  C. The Major D7 uses D - A -F# or Gb - C. the big difference is the F and F#. Tuning was developed to facilitate easy playing of these 7th chords and the major and minor chords.

Contrary to popular belief the earliest known blues is from Appalachia. It is mostly settled by "Gaelic" people of Welsh, Irish, and Scottish descent, and blacks. The experts believe the Gaelic people [which included the Druids] migrated in the far ancient past from India, as did the Gypsies. So first look at other scales related to this heritage. 

The Hindu scale is 1 • 2 • 3 • 4 • 5 • b6 • b7. The Ethiopian scale is 1 • 2 • b3 • 4 • 5 • b6 • b7. An Oriental scale is 1 • b2 • 3 • 4 • b5 • 6 • b7. The Spanish Gypsy is 1 • b2 • 3 • 4 • 5 • b6 • b7. Adding to this music style mixture were Italian and Portuguese people who used the Maximilian scale. And in this area were also Germanic and Italian neighbors. 

As a result of all these cultures they gravitated toward a compromise scale called the Dorian. The Dorian scale is 1 • 2 • b3 • 4 • b5 • 5 • 6 • b7. Combine all these cultural scales and you have a good 7 note blues scale for riffs and arpeggios. 1 • 2 or b2 • 3 or b3 • 4 • 5 or b5 • 6 or b6 • b7.  So, to round out the blues scale you can add elements of the other related scales. Over time the The abbreviated Pentatonic  Blue scale of 1 • b3 • 4 • b5 • 5 • b7 was often used.

The African slaves brought to America and the Appalachia a unique "instrument" to teach children to play music. It is the forerunner of the Diddley Bow. On the side of the house a one string device was fixed and was played by "fretting" it with a piece of bone, ceramic, or metal. This "slide" fretting carried over into the Blues style. Tuning was often modified to facilitate the slide style. 

A style of chording followed on multi-string instruments to facilitate this slide style and blues tunings. However, real blues is never slide alone but requires some finger fretting. The slide set up allowed for the bb often encountered in Blues.

In Blues the root can be played as a major, minor or 7th, This also holds true for the IV and V. The vi is always played as bvi, the vii as bvii, and the iii as biii. The I for "D" can be D, Dm, or D7, the IV G, Gm, or G7, the V as A, Am, or A7, the vi as Bb or Bbmaj7, the vii as C and the iii as F. 

Finally, there is a lot of commonality in all the Appalachian music. Blues, blue eyed blues, bluegrass, and Bakersfield country all share a lot of the elements and instruments developed in the Appalachian area to accommodate these styles. To truly understand Blues requires some understanding of its Appalachian cousins and the Appalachian instruments it originated on.

I am still trying to figure out the notes on an open D, 4 string in relation to reading music scores.

Does the first D string note fall below the position shown on my chart?

Where is middle C on an open tuned 4 string CBG on the chart below?

So where do the high notes occur on a music score then or are the duplicates ?

If this was chromatic this would be sequential but as it's open tuning its surely not?

I'm not quite getting the translation to music score notes can anyone clarify?

This was my 10th guitar, and my first serious attempt at a 4 stringer:

I was never really happy with it: the box I had made (out of 6mm ply and 3mm sapele for the soundboard) was big and a bit unwieldy, I had also originally intended to have only 9 holes on either side but unfortunately a beer and drill related accident meant I had to add more to make it symmetrical.

I also had a couple of problems with this guitar - the neck was not secured well enough to the box and there was some uplift on the neck. Not a bow in the wood as such, but it was making the action uncomfortably high. I also managed to leave it leaned against an external wall in very cold wet weather, and the damp made the soundboard all spongy and raised the grain on the neck. You could say I had some bad luck with this build.

I worked on a couple of other projects for a while and came back to this one, with the intention to rebuild the box. I started by making a pickup for it:

Well, I made a couple of pickups... the one on the right is obviously the one for the 4 stringer. I used a scrap of oak from the fretboard for the top of the bobbin. 6400 wines of 42AWG and alnico 5 magnets. I was going for a nice mellow tone on this one so I didn't want to overwind.

I had a couple of pre-made plain craft boxes left over so I planned to use on of those. The only problem is they don't sound good (very thick lid etc). I planed off the original lid and made a new one out of the same solid sapele stock I used for the original. I used a bit of Rustin's walnut stain on the box to make it look a bit more interesting.

This pic shows the underside of the soundboard. I glued two 100mm strips together and used 5x6.5mm spruce strips for the bracing. The hole at the top is for the pickup. I added a scrap of 6.5mm thick sapele to act as extra support under the bridge to counter the extra tension of 4 strings.

I glued the new lid on, attached the neck (very securely) to the bottom of the box and finished everything with a few coats of Danish oil.

...and that's the finished article; 4 strings tuned GDgb, 4 pole pickup, volume & tone control.

Sound holes - just 6 this time, I used 6mm inside diameter grommets from a leather craft supplier on eBay. You might notice the magnets are a bit wonky on the pickup. Not intentional! Sounds fine though.

The bridge is made from a scrap of oak from the fretboard and a tiny strip of bone from a guitar saddle blank (I get 4 CBG bridges from one blank). I just use a drill to make the bridge 'arches' and sand it to a point. Volume (A250k) and tone (B250K) control with a .047uF Sprague Orange Drop capacitor. The tailpiece is a bit of sapele with a piece of brass sheet glued to it. The string ferrules are bike spoke nipples. The copper plate is connected to the ground on the back of the volume pot.

I loved working with sapele for this neck. Compared to oak it cuts like butter with a spokeshave and smells lovely. I'll definitely order some next time!

To make this headstock I cut a section out of the top of the neck blank and glued it to the bottom, then shaped it with rasps and sandpaper.

That's it. Now I can get back to playing it!

Rick