The Relationship Between Keys & Chord Forms

Into my last article, Guitar Chord Theory - Hang-in There Its a Long Story we looked at scales and the order of steps and half-steps are actually used to make a scale. If you haven't read it you probably should as it will turn this into article much easier comply with. It's important to remember that different scales have a different number of sharps or flats in them.
A key for our purpose is a bunch of related chords that sound good together. If you already play guitar feasible have noticed that a song that starts with a C chords is more than likely to have F & G chords with it and maybe an Am chord also. This tells us that the song is actually in the key of C, not so much when the song starts on C but because if romantic relationship of the chords, if ever the song started on the F chord it can still be in the Key of C. another example nicely a song with G C D and maybe Em, this song will in the key of G because of romantic relationship of the chords.
Let's use the C Major scale as it suits the purpose optimum.
C Major Scale: C D E F G A B C
Scale Degrees: 1 2 3 4 5 6 7 8
Roman Numerals: I II III IV V VI VII VIII
All major chords are made up of the 1st, 3rd and 5th levels of a scale. This hands us in the Key of C: C E G This is since a tonic triad. The C is the root note of the scale and chord. It likewise the tonic note. C E G is a C major tonic triad. 'Tonic' since it includes C as the first note and 'triad' since it has three (tri) notes in it.
When we talk of chords built on the different degrees of a scale we use Roman numerals.
The most important and finest sounding chords that blend in with the C Major scale are chords tend to be built on the IV & V degrees of these scale. This gives us chords built on F(IV) and G(V).
A chord/tonic triad built on the IV i.e. F would be F A C (F A C being the 1st, 3rd and 5th degrees of an F scale) the chord/tonic triad would be an F Major chord.A chord/tonic triad built on the V i.e. G may possibly G B D (G B D being the 1st, 3rd and 5th degrees of the G scale) the chord/tonic triad would be a G Major chord.
The reason these two chords are so well suited for C is that both have notes in normal with the C Major note. F(IV) has the note C in accordance and G(V) has the G note in general. These common notes make the changes between the chords easy on the ear. Each IV and V are major chords.
The next most likely chord to be used is one that created on the VI degree i.e. A and the most important 3rd 5th of the A scale is A C# E, well we shouldn't have a C# in a in because there is not a C# in the C scale. The C# must become a C and would then be A C E and action an A minor chord. So in pet tracker , a chord built on the VI of the scale for you to be be a minor chord. This follows with all chords built on the notes of a scale, they must comply with the C scale.
All chords we wish play in a key should be built on your notes of that scale. This applies to any key we play in i.e. on key of A we use only the notes of the A size. In the key of G only the notes of the G scale.
Below is a chart with the C major scale and the different chords that can be built on each degree of the scale, the note found in each chord, and design . of chord.
All other Keys have the same association of chords i.e. the II, III & VI should always be described as a minors. The VII will always like a minor b5.
It isn't necessary that this method be taken and many songs have been written using whatever chords the writer desires.
It does however give us situation with health develops behind compatible chords that can double as additional or passing chords within a song.
Chords built through the scale degrees
Scale Degree Tonic Triad Chord Type
C I C E G C (Major)
D II D F A Dm (Minor)
E III E G B Em (Minor)
F IV F A C F (Major)
G V G B D G (Major)
A VI A C E Am (Minor)
B VII B D F Bmb5 (Minor b5)
C VIII C E G C (Major)
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