A "Jazz Chord is defined as being one that has added tone or extensions. So if you have a C chord, you can add different tones of a C major scale to it to make it more interesting. Examples would be a C major7, C major6. These are common subtitutes for an average C chord. You can impress your friends when you jam if you throw a chord like that into a progression. (the patterns are moveable and are easily found all around the internet).

The same can go with minor chords, so if you are in C major (easy theoretical key), the order of chords would be: C major, D minor (7th), E minor (7th), F major, G major, A minor, B diminished 7th, and then on to C again. If you were to use the number system to outline this it would be: I, ii, iii, IV, V, vi, viii (dim is a small dot to the upper right), I. When you play the notes of a C major scale.. you are playing C, D, E, F, G, A, B, C. Those are the notes that make up the scale and tonalities of chords do not matter much if you are just practicing, however, If you go to play an actual chord progression in C. You can use the variety of chords above to shape your progression, then of course you would use the C major scale (and relative minor: ), I'm big on that) to solo over your chord progression (Modes are also useful with this, and all modes are, are when you start the C major scale on a different note of the same scale). I'll explain that for you in a sec. So back to the numbers.

All the numbers are, are a system that musicians can use to communicate quicker with each other in jam sessions. a capital roman numeral is a major chord... ex. I (1), IV (4), V (5). a lowercase roman numeral is a minor chord.. ex. ii (2), iii(3) vi ( 6 ) the only exception is the 7th diminished chord which has lowercase roman numerals and a small dot to the upper right (I cannot add it for you on a computer, its just to let you know what it is if you are ever looking at jazz lead sheets). So anytime you see the Major progression, no matter what the key is... it could be written in Numerals to save time transposing if everyone is familiar with the key. The order of those numerals in the major scale is: I, ii, iii, IV, V, vi, viii (dim is a small dot to the upper right), I. and that goes for the chords I might add in case I did not. So to give you another example... if you were to go by the above matrix... and your band or friends wanted to do a tune in G... you would know by memorizing this (or just knowing it), that if your in G the first chord would be G major of course ( I ), the second chord would be A minor ( ii ), the third chord would be B minor ( iii ), the fourth chord would be C major ( IV ), D major ( V ), E minor ( vi ), F# diminished ( vii ) then to G major ( I ) to complete it. (This is also a useful tool in figuring out simple recorded music because if you know the tune is in G, then you have the chords related to it laid out for you).

So back to the minor chords, since the same can apply to minor chords, (you already have a basic foundation of the order of the chords) you can begin to create embellished chord progressions with Major and Minor 7th and 6's. These are great ways to envoke the Jazz feel and once you learn your scales and modes, you can improvise over things that you make up. Other chords that you should learn are: Diminished 7th, 7th, 9 chords, etc.

A quick note on Relative Minor.
At this time, I would like to mention something about relative minor chords. I think that this one of the most important things for a Jazz guitarist to grasp the concept of. Here is an example: if you take the key of G major, and play the 6th chord of the chords family, which is Eminor... you may notice that they are similar in sound. That is because many of the notes in a G major chord are also in an E minor chord. If you are playing a solo in G major, you can also go up to E minor and play licks there too. This is a very useful little device when you are doing stuff in Major keys and want to get a different sort of feel for it.

Dominant Chords:
These are chords that other chords just seem to want to lead to. Examples of these are V chords, IV chords, and the I chord. A diminished chord with pull to the one chord. The 3rd and 4th minor chords can pull either to the I, IV, or V depending on how youwant it to sound. Same goes for the V chord. The V chords are used many times to end a progression and begin another. (or the repeat the measures).

About Modes.
This is very hard for me to explain with out being there to show you or without Scale diagrams.. Now that you know each Note in the major scale has a different chords with it... you can derive that I scale also goes with each of those chords. There are called "Modes". If you know your major scale then you know evey mode. All you have to do is start the scale on a different note. So.. for instance if you wanted to play the second mode in C ( D minor), you would play the following notes: D, E, F, G, A, B, C, D. Do you see the relation of this scale to the C major scale? If you take the C major scale: C, D, E, F, G, A, B, C... Notice that the above scale is the same really but only starts on a different note. The same would go for all the degrees of the scale. Once you learn all of those and the chords, you can build very good sounding little peices.

I hope that this has helped you significantly. I know for sure it helped me.. and I also understand that you may not have a deep understand of music theory. It okay actually... Just start out by learned the notes of the guitar neck (If you have not yet). To get you started the order of the notes starting with the Open low "E" are: E (open), F, F#, G, Ab, A, Bb, B, C, C#, D, Eb, E again (that should be the 12th fret). If you know what octaves are.. then you can figure out with some practice all the notes on the neck.

Interesting and informative. I appreciate how much time it took you to post this. Thank you! :)

Thank you! It's fun for me though lol I like to talk about theory :P
I posted two other lessons that you may find helpful.

Good work PB - a good intro to a complex subject.

I'm doing a bit of work on the old Jazz guitar side of things myself at the moment. I can recommend Ted Greene's books Single note Soloing Vol 1 & 2 as great for taking you from the basics to more advanced concepts of jazz soloing. They are only about £10 each on Amazon. Well worth checking out if you are into expanding into Jazz.

Thanx PerpetualBurn. I'm pretty brushed up on my knowledge of scales and modes but Jazz I know nothing about and it's always good to have as much knowledge in your repertoire as possible.

I'm off to practise my Amaj7thb13dim9sus4#5th chords. :P

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Nice work perpetualburn,thanks for this text