LO1 to know about pitches and intervals
Intervals
Intervals are the distance between two notes, which can be called various different names for how many semitones they are apart (half steps).
-Major
You can determine whether an interval is major or not by the amount of semitones between the two notes (Semitones are half steps for instance going from a c to a c# is a semitone):
-2 s/t = major 2nd
-4 s/t = major 3rd
-5 s/t = perfect 4th
-7 s/t = perfect 5th
-9 s/t = major 6th
-11 s/t = major 7th
-12 s/t = (perfect) octave
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Major Intervals |
-Minor
MINOR INTERVALS
1 semitone LESS THAN a major makes it a minor. So the following intervals have 3 semitones (and three letter names), and are therefore are MINOR 3rds.
G-Bb
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Minor Intervals |
-Perfect
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Perfect Intervals
When a perfect interval is raised by a half step, it becomes augmented.
When
a perfect interval is lowered by a half step, it becomes diminished.
A 4th interval (ie 4 letter names) is Perfect if it has 5 semitones, as you can see in the list above. A 5th interval (ie 5 letter names) is Perfect if it has 7 semitones.
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-Augmented
1 semitone more than a major makes it Augmented.
So Gb-B, having 5 semitones (and three letter names), is an Augmented 3rd.
-Diminished
As explained above, 1 semitone less than a major makes it a minor. A further semitone less makes it Diminished.
So G#-Bb, having 2 semitones (and three letter names), is a Diminished 3rd.
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Diminished Sevenths
Diminished sevenths are the tonic chord with a minor 3rd on top. |
-Simple
Simple intervals are intervals less than an octave. (for instance a major 2nd or a perfect 4th).
-Compound
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Compound Intervals
Compound Intervals are intervals which are greater than an octave. |
Compound and Simple intervals are however related:
Major 9th / Major 2nd |
Major 10th / Major 3rd |
Perfect 11th / Perfect 4th |
Perfect 12th / Perfect 5th |
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Each compound interval is related to a simple interval. By subtracting 7 from the compound interval you get the related simple interval. For example 9 - 7 = 2, so a 9th is related to a 2nd.
Pitches
-Degrees of the scale
There are different degrees of the scale which are referred to as:
- Tonic
- Supertonic
- Mediant
- Subdominant
- Dominant
- Submediant
- Leading Tone
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Degrees of the scale. |
-Tones
Tones are made up of two semitones, so two half steps ( a whole tone).
A whole tone scale:
The whole tone scale has no leading note and because all tones are the same distance apart, no single tone stands out, the scale creates a blurred, indistinct effect. This effect is especially emphasised by the fact that triads built on such scale tones are augmented. Indeed, one can play all six tones of a whole tone scale simply with two augmented triads whose roots are a major second apart. whole tone scales do not give a strong impression of the tonic or tonality.
-Semitones
Semitones are half steps, going up or down chromatically one step. Two half steps make a tone. for instance a chromatic scales is a scale which goes up in just semitones.
Chromatic scale:
The right hand shows chromaticism upwards and the left hand shows chromaticism downwards.
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Advance Note Reading. |
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Enharmonic note equivalents. |
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Scales |