There we go, I'm using roman numerals and there is a reason some are capital and others are not this is because the capital I IV and V are major chords within the key of C and ii, iii, and vi are minor with vii being diminished. Taking our triad chord we get C, E, and G remember; in the scale degrees up there this makes it where a major chord is 1 3 5 in the scale this is our formula for our major chord. Therefore if you took each note C D E F G A and B and wrote them out in there major scale you would see that within our C scale the only 3 chords which fit into that major chord formula (1 3 5) would be C F and G. Therefore in the key of C there are three major chords C F and G. What about the rest of the notes why are they lower case? well the D, E, and A notes are minor and the B is a diminished chord. I won't talk about the dimished chords or augmented in this lesson but why are these minor you say? Well it requires some information on modes... A major scale is what you see above starting at the root note and ending on the same. A mode is changing this pattern, so if I wanted A minor also called A aeloian mode I would take that sixth chord start and end on it its the "natural" minor. Therefore, doing this
I ii iii IV V vi vii I C D E F G A B C
(Note that they are still in the same order in order to be a mode it has to be those notes in correspondence with their roman numeral to bring it into playing you could play any of those notes on your guitar and still be in the key of C but starting and ending on these patterns evokes a certain tone and this is how you can come to recognize music e.g. is it major or minor a certain progression etc. but focus on the basics first.) Notice that the roman numerals are changed in which one starts first but the I through vii is still intact. You can do this with each note and get the same result and they all have different sounds; try it, play just on the A string starting at the 3rd fret (C) and do the major scale formula. Take a listen to it and now start at the A and do W H W W H W which is the C major scale starting at A, sounded completely different didnt it? That's A minor, so in relation C major=A minor they are the same notes and the different modes can be played by starting at different notes within the scale in the same manor I won't name them all in this lesson. This also goes for any other scale not only C, for example I mostly play in E minor (or G major) so E minor=G major check it write the major scale out its always the 6th note in the scale. Now that we know that the 6th is the minor scale what is a minor chord? Well lets do our triad again, every other note in the C major scale starting at A therefore: A C E. this is a minor chord formula in numbers (6 1 3) if you took the ii, iii, and vi chords of any major scale and wrote there corresponding minor scales out you would see that those chords are (6 1 3) which is a minor chord. Those are you major and minor basic chords in theory I will get into bar chords and positions on the fretboard in the next lesson with scale theory and modes again expanded on. Thanks for reading and just work at it, eventually it becomes natural and you can play in any key, change keys, and come up with other chords of your own and develop your own sound... Anyway
vi vii I ii iii IV V A B C D E F G
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