Whether two voices reach a perfect interval by similar motion from an
imperfect one (a hidden/direct fifth or octave).
The traditional step exception is applied: the approach is allowed when the
upper of the two voices moves by step, so only leaps into the perfect
interval are flagged.
Whether two voices reach a perfect interval by similar motion from an imperfect one (a hidden/direct fifth or octave).
The traditional step exception is applied: the approach is allowed when the upper of the two voices moves by step, so only leaps into the perfect interval are flagged.