- How do you know if octaves are parallel?
- Why are there no parallel octaves?
- Are parallel octaves ever?
How do you know if octaves are parallel?
Octave doubling
More ranting: Parallel octaves equals consecutive octaves. An example of this, say in a SATB choir arrangement, would be having the bass voice and the alto voice both sing first a G and then a C (or any other two same consecutive notes one (or two) otave(s) apart or in unison).
Why are there no parallel octaves?
Parallel octaves and fourths
Consecutive fifths are avoided in part because they cause a loss of individuality between parts. This lack of individuality is even more pronounced when parts move in parallel octaves or in unison. These are therefore also generally forbidden among independently moving parts.
Are parallel octaves ever?
Parallel 3rds, 6ths, 4ths, and even tritones are all OK. Unisons (two parts sharing the same note) count as a kind of octave. Thus, these two instances are also bad. Sometimes students start to see parallels when there aren't any, because they get confused as to which notes belong to which voice.