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Parallel Octaves

Definition

Parallel octaves are similar to parallel fifths, but instead of moving in perfect fifths, two voices move in perfect octaves in parallel motion. Like parallel fifths, this creates a specific sound that may be considered undesirable in traditional music theory.

Analogy

Imagine two people singing the same note at different octaves while walking side by side. If they always maintain the same distance between them as they walk, it's like they're stuck in parallel octaves. This lack of variation can make their singing sound less interesting.

Related terms

Consecutive Octaves: Consecutive octaves occur when two voices move from one perfect octave interval directly into another perfect octave interval without any intervening notes or chords.

Doubling: Doubling refers to assigning multiple voices or instruments to play or sing the same pitch within a chord. When doubling is done poorly and results in parallel octaves, it can weaken the overall texture and harmonic richness.

Voice Independence: Voice independence refers to each voice having its own unique melodic line within a composition. The avoidance of parallel octaves helps maintain voice independence and prevents certain voices from sounding too similar.