In an earlier document of this forum we spoke about Major and Minor chords, which are called 3-tone chords because ... yes you guessed right, they are based on 3 notes.
1-3-5 for major and 1-♭3-5 for minor.
(1 is also many times noted as 'R' = root)
Now these are not the only 3-tone chords.
there are others, so let me list them for you.
sus 2 (1-2-5) <- click to get more information
sus 4 (1-4-5) <- click to get more information
Diminished (1-♭3-♭5) <- click to get more information
flat 5 (1-3 -♭5)
In this document I will focus on the augmented chords.
See definition below:
In an augmented triad, the fifth or top of the three notes of the chord is sharpened (raised half a step). It is indicated by the symbol "+" or "aug." For example, the C triad in a major scale is formed by playing C (the root note), E (the third note), and G (the fifth note). To create an augmented C triad chord, you would play a G sharp, rather than a G.
The chord fomula is noted as 1 - 3 - #5
Here are the some examples of augmented chordss:
C aug = C - E - G#
A aug = A - C# - F
E aug = E - G# - C
Augmented chords don’t sit in the regular Minor or Major scales. Instead, they live in the Harmonic or Melodic Minor scales. This makes them quite an unusual choice for chord progressions, since most composers stick to minor or major scales. Augmented chords are used in a lot of modern rock music, such as Foo Fighters – Generator.
The tense, anticipatory nature of the chords suit this kind of dramatic, progressive tension.
They are less common in pop and dance music for the very same reason.
Having said that, songs like Juju, by Wayne Shorter are good examples of augmented chord usage in the type of jazz that hip-hop artists have often sampled – so, in a roundabout way, augmented chords have made it into modern popular music.
Good books for beginners : (click on the image)