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→Augmented Chord
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Whoa? What's that III+ (C+ ) chord? Augmented? Yeah, we may have got ahead of ourselves slightlyThis is an augmented chord.
An <u>augmented triad chord</u> consists of a root note, its major 3rd, and its augmented 5th. The augmented fifth is a major 3rd above the major 3rd, so the chord consists of 2 major thirds and one augmented 5th (and their inverses). While the major 3rds are quite harmonic, the augmented 5th is a bit less so - more similar to a minor 3rd. But the real kicker is that we're missing the perfect 5th, which is the most harmonic interval. Thus, the chord sounds quite weird.
Also, the distance from the augmented 5th to the octave is another major 3rd. Thus, the augmented chord looks like a bunch of stacked M3 intervals.