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→Augmented Chord
Whoa? What's that III+ (C+) chord? This is an augmented chord.
An <u>augmented chord</u> consists of a root note, its major 3rd, and its augmented 5th. The augmented fifth is a major 3rd above the same distance as two major 3rd3rds, 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. Here are some fingering charts:
{|
{|class="wikitable"
!! ! C+ !! E+ 2nd Inv. !! G{{s}}+ 1st Inv.|-! Note 1| C || B{{s}} || B{{s}}|-! Note 2| E || E || D{{s}}{{s}}|-! Note 3| G{{s}} || G{{s}} || G{{s}}
|}