Usually chords are constructed by taking every other note of a scale, constructing the chord in thirds. However this isn't the only way of constructing chords, they also be built up in 4ths (called quartal harmony) and 5ths (quintal harmony).
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Quartal and quintal chords have an open sound quite different to chord built in 3rds in the traditional way, they are often used in modal music - that is music based around a mode rather than harmonic chord progression. The chords are then taken through the scale, you could for example try taking this chord through the C major scale e.g.
D, A, E, B
E, B, F, C
F, C, G, D etc
Although this chord is not constructed in a traditional way, we can also think of it as C69 (no 3rd).
Tune in tomorrow for another Guitar Chord Of The Day.
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