Aloysius
Intervals
- Unison: Perfect
- Second: Dissonance
- Third: Consonance
- Fourth: Dissonance
- Fifth: Perfect
- Sixth: Consonance
- Seventh: Dissonance
- Octave: Perfect
Motion
- Direct: When two or more parts ascend or descend in the same direction by step or by skip.
- Contrary: When one part ascends by step or by skip and the other descends.
- Oblique: One part moves by step or by skip while the other part remains stationary.
Fundamental Rules
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From one perfect consonance to another perfect consonance one must proceed in contrary or oblique motion.
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From a perfect consonance to an imperfect consonance one may proceed in any of the three motions.
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From an imperfect consonance to a perfect consonance one must proceed by contrary or oblique motion.
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From one imperfect consonance to another imperfect consonance one may proceed in any of the three motions.