Music Theory - Definitions
Definitions referenced in other pages.
Intervals
On the staff, notes are connected by intervals. Given the size of the interval, different names are given to a sequence of two notes:
STEP | 2m, 2M |
SKIP | 3m, 3M |
LEAP | ≥ 4 |
Consonance
Inside the diatonic scale, we find consonant and dissonant intervals. One of the ideas of counter-point is to build a beautiful and interesting melody by using only consonant intervals upon metric accents (this is more detailed in here).
Consonant
Perfect Intervals | Unison, Melodic 4, 5, 8 |
Imperfect Intervals | 3, 6 |
Dissonant
Diatonic | 2, 7 |
Not diatonic | 5dim |
Motion
It’s the idea of the vertical direction two melodies take in a counter-point (e.g. do melodies separate from each other or do they get closer?). Again, some motions are preferred in counter-point, because they embellish the melody and make it more interesting.
Contrary
In contrary motion, both melodies move towards each other or in opposite directions.
This is the preferred way of motion in counter-point.
Oblique
This one is to be avoided.
Parallel
Moving by the same interval.
Allowed between imperfect consonances.
Similar
Same kind of motion but with different intervals.
If landing on a 5, the upper voice approaches by a step.