Counterpoint part 3
In Lesson 3 were talked about three forms of speciesin music. first, second and third species.
First species ratio form is 1:1 where each note is a whole note through out the cantus firmus. Second Species ratio is 2:1 where each note is a half note or 2 half notes in each bar. Third species ratio is 4:1 where there is each quiater note or beat in each bar.
When reading or creating a cantus firmus you must always be constance and dissonace.
Constance is when two notes sound good playing together and dissonance is the clash between two notes making them sound terrible.
In those kinds of music you have passing notes and neighbour. Passing notes are notes that are move stepwise and neighbour notes that move toone chord and comes back to the tonic.
Constance notes are on the accented beat and dissonace is on the unaccented.
There are rules we must follow when dealing with a cantus firmus. This video gives a concept of what we should look out for when dealing with second species.