Guitar Chord Theory
Part 1 — Triads
Triads are built out of three notes.
There are four main types of triads: major, minor, diminished, and augmented. Triads are basically three notes with the interval of a third in-between each of them.
interval of a third: The basic construction of a triad would therefore contain a note, then an empty space, then the note, another space, and finally, the last note.
Side note: Each note is the interval of a third, since the note and the space count as one each, it gives us 1, 2, 3 (note, space, note). As a result, there are only two “types” of third intervals where we are left with only four possible combinations of triads.
From the C major diatonic
C D E F G A B C
MAJOR TRIAD: 1 3 5
Like C E G
MINOR TRIAD: 1 b3 5
Like C Eb G
DIMINISHED TRIAD: 1 b3 b5
Like C Eb Gb
AUGMENTED TRIAD: 1 3 #5
Like C-E-G#
Other Triads
Other types of triads (other than 3rd interval) also exist such as
SUS4: 1 4 5 & SUS2: 1 2 5.
These two triads are quite popular in popular songs.
The “SUS” means suspended because the note replacing the “3” in both cases is said to be a suspension of that “3”.
Furthermore, there are a couple of other uncommon oddballs too which we won't bother naming for now (1 3 b5 and 1 b3 #5).
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