Timbre is not an element of melody because it is a property of sound that is not related to the pitch, rhythm, or dynamics of the sound.

A theme is a melody that is repeated throughout a piece of music, often in different variations.

Diatonic is not a type of melody, but rather a scale that is used to create melodies.

Harmony is the term for the relationship between two or more melodies that are played simultaneously.

Chromatic harmony is not a type of harmony, but rather a technique that uses chromatic notes to create tension and interest in the music.

A cadence is the progression of chords that creates a sense of resolution at the end of a piece of music.

A plagal cadence is not a type of cadence, but rather a type of chord progression that is often used to create a sense of rest or resolution.

Harmony is the term for the relationship between the melody and the harmony in a piece of music.

The tempo of the piece does not affect the relationship between melody and harmony.

Harmonization is the process of creating a melody that is harmonically compatible with a given chord progression.

Using parallel fifths is not a technique that can be used to create a harmonically compatible melody because it creates a dissonant sound.

Counterpoint is the process of creating a melody that is independent of the harmony.

Using parallel motion is not a technique that can be used to create an independent melody because it creates a dissonant sound.

Counterpoint is the term for the relationship between two or more melodies that are played simultaneously and are independent of each other.

Quadruple counterpoint is not a type of counterpoint, but rather a technique that uses four independent melodies that can be played in any order.