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How does a mode differ from a key or tonality in Western music?

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mode The universality and innate nature of music, and the pentatonic scale, as demonstrated by singer Bobby McFerrin.

In Western music, the terms mode, key, and tonality represent distinct but related concepts of musical organization.

Mode

A mode is a theoretical framework that defines the "vocabulary" of a melody by ordering the notes of a scale based on their intervals relative to a tonic. Modes are primarily concerned with melodic structure rather than harmonic progression. Historically, church modes were used to organize vocal music, and they remain useful for analyzing folk music because they are often impervious to the rules of Western functional harmony.

Key and Tonality

In contrast, key and tonality are central to the Western system of functional harmony that dominated music from approximately 1650 to 1900.
* Key refers to an organizational base built around a specific tonic note and its corresponding scale. It establishes a hierarchy of chords and notes that create tension and resolution.
* Tonality is the broader principle of organizing music around a central tone. It describes the specific system of relationships between notes, chords, and keys.

While modes focus on melodic patterns, the system of tonality relies on the interplay of major and minor scales to drive musical structure through modulation and harmonic tension.12