In musical notation or instrumentation, the distance between two notes becomes a interval termed. When playing separate notes, you play a melody. The distance between these tones is called a melodic interval. If you play two notes at the same time, on the other hand, it is called a harmonic interval. A chord in musical notation is an example of a harmonic interval.

Interval

The first step in naming an interval is to look at the distance between the notes as they are written. The number of an interval is based on the number of lines and spaces in the music staff interval. You should simply add the lines and spaces to the interval. You have to count each line and space between the tones, as well as the lines or spaces on which the notes are. You can start from the top or bottom, that doesn't matter. If you go more than eight, you'll be past the octave. At that time, the interval becomes known as a compound interval. For example, if you go to 10 lines and spaces on the staff, you would have a melodic tenth. 

Interval quality

Interval quality gives an interval its own sound. When considering the interval quality, you would count half steps from one note to another. For example, if sharp or flat surfaces are written in the music. Sharps and surfaces can raise or lower the pitch of a note by half a step. Interval qualities are called important, small, perfect, reduced, and extensive. Each of these qualities has rules. For example, if an interval is considered 'big', it contains two half steps between the notes. Similarly, the other qualities have a rule that gives them their unique sound. An interval is fully identified when you give both the quantity and quality of the interval. For example, some melodic intervals include a “big third”, “perfect fifth” or “diminished seventh”.

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