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Understanding Musical Intervals:
Next, you should understand the definition of what exactly an interval is. An interval is the distance in pitch between two tones.
For example: "C" tone to an "A" tone is a 6th.
Each interval name is a combination of quantity and quality.
QUANTITY = The total number of letter names an interval contains.
There are two categories of intervals:
(1). PERFECT INTERVALS - Which include: 1st (unisons), 4th, 5th, 8th (octaves)
(2). MAJOR or MINOR INTERVALS - Which include 2nd, 3rd, 6th, 7th
ASSIGNING QUALITY: There are four rules for assigning Quality...
#1). When a major interval is decreased by a half step it becomes MINOR.
#2). When a minor or perfect interval is decreased by a half step it becomes DIMINISHED.
#3). When a major or perfect interval is increased by a half step it becomes AUGMENTED.
#4). When a minor interval is increased by a half step it becomes MAJOR.
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