With the appearance of passing notes, the detection of parallel 8ves and 5ths becomes a little more complex. Guiding rules are
- Open : Parallel with a passing note in one voice. This is bad.
- Symmetrical : Parallelism on strong beats is bad. On weak beats is possible
- Asymmetrical : Parallelism not in corresponding places in the mesaure - 8ve in strong beat followed by an 8ve on a weak beat. This is possible and good.
If one of the perfect 5ths is used as an unessential, then that is ok.
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