Musical Intervals and the Structure of Melodic Language

Introduction to Musical Language

The way musical language occurs is analogous to how literal language is produced.

A **Phrase** is a group of sounds that convey more or less complete sense.

The fundamental elements form the basis of a scale, capturing and ordering sounds to express greater meaning.

Components of Musical Structure

The phrase can be divided into two smaller parts called **semiphrases** or **periods**. These can, in turn, be divided into an even smaller unit, the **melodic motif**.

The material is basic and simple. From a group of three or four notes, we create sentences. We continue this parallel between literal language and musical language.

With a few sentences, we create a musical theme. With this theme, we will make a song. The words and melody often match. A melody is sometimes formed by two or more phrases, which may be more comprehensive than a simple sentence. Distinct pitch sounds are ordered to produce the feeling we wish to convey. The basic element of a melody is the feeling produced by the interval of heights (pitches). What is most important is the difference between the heights of the notes.

Understanding Musical Intervals

Defining the Interval

An **Interval** refers to the distance between one sound and another pitch entity. Melodies depend on the relationship between the heights (pitches) of the notes. We always count the notes within the interval, including the end notes.

Types of Intervals (Direction and Simultaneity)

Intervals can be classified based on their direction and whether they occur successively or simultaneously:

• Ascending: Moving from a low note to a high note.
• Descending: Moving from a high note to a low note.
• Melodic Interval: Occurs when one sound follows the other (successive).
• Harmonic Interval: Occurs when sounds happen at the same time (simultaneous). Direction is not specified (used in two voices or polyphonic instruments).

Types of Intervals (Size)

• Simple Intervals: All intervals up to the octave (8th), including it.
• Compound Intervals: Those starting from the ninth (9th) and larger.

Types of Intervals (Stepwise Motion)

Intervals can also be classified by how the notes move in relation to the scale:

• Conjunct Intervals: These consist of two notes that occur in the order of the scale (stepwise motion), such as the 2nd.
• Disjunct Intervals: These are intervals where there are notes missing between the two pitches (leaping motion). These typically start from the 3rd.

Interval Quality (Tones and Semitones)

Given the number of tones and semitones, intervals can be classified into five types of **Quality**:

• AUGMENTED
• MAJOR
• PERFECT (Just)
• MINOR
• DIMINISHED (Reductions)

What interests the musician is the exact number of tones and semitones contained within the intervals. Knowing this determines the precise quality of the interval. Intervals that are three tones smaller than expected are often diminished.