Tonality

Tonality is a system of writing music according to certain hierarchical pitch relationships around a "center" or tonic. The term tonalité was borrowed from Castil-Blaze (1821, François Henri Joseph Blaze) by François-Joseph Fétis in 1840 (Reti, 1958; Judd, 1998; Dahlhaus). The term is often used synonymously with major/minor tonality; however, in more recent theory, the term is used more broadly to encompass a number of systems of musical organization.

Theory of tonal music

Tonality allows for a great range of musical materials, structures, meanings, and understandings. It does this through establishing a tonic, or central chord based on a pitch which is the lowest degree of a scale, and a somewhat flexible network of relations between any pitch or chord and the tonic similar to perspective in painting. This is what is meant by tonality having a hierarchical relationship, one triad, the tonic triad, is the "center of gravity" to which other chords are supposed to lead. Changing which chord is felt to be the tonic triad is referred to as "modulation". As within a musical phrase, interest and tension may be created through the move from consonance to dissonance and back, a larger piece will also create interest by moving away from and back to the tonic and tension by destabilizing and re-establishing the key. Distantly related pitches and chords may be considered dissonant in and of themselves since their resolution to the tonic is implied. Further, temporary secondary tonal centers may be established by cadences or simply passed through in a process called modulation, or simultaneous tonal centers may be established through polytonality. Additionally, the structure of these features and processes may be linear, cyclical, or both. This allows for a huge variety of relations to be expressed through dissonance and consonance, distance or proximity to the tonic, the establishment of temporary or secondary tonal centers, and/or ambiguity as to tonal center. Music notation was created to accommodate tonality and facilitates interpretation.

Related Topics:
Perspective - Polytonality - Ambiguity

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The majority of tonal music assumes that notes spaced over several octaves are perceived the same way as if they were played in one octave or octave equivalency. Tonal music also assumes that scales have harmonic implication or diatonic functionality. This is generally held to imply that a note which has different places in a chord will be heard differently, and that therefore there is not enharmonic equivalency. In tonal music chords which are moved to different keys, or played with different root notes are not perceived as being the same, and thus transpositional equivalency and far less still inversional equivalency are not generally held to apply.

Related Topics:
Octave equivalency - Enharmonic equivalency - Transpositional equivalency - Inversional equivalency

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A successful tonal piece of music, or a successful performance of one, will give the listener a feeling that a particular chord — the tonic chord — is the most stable and final. It will then use musical materials to tell the musician and the listener how far the music is from that tonal center, most commonly, though not always, to heighten the sense of movement and drama as to how the music will resolve the tonic chord. The means for doing this are described by the rules of harmony and counterpoint, though some influential theorists prefer the term "through-bass" instead of harmony, the concept is the same. Counterpoint is the study of linear resolutions of music, while harmony encompasses the sequences of chords which form a chord progression.

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Though modulation may occur instantaneously without indication or preparation, the least ambiguous way to establish a new tonal center is through a cadence, a succession of two or more chords which ends a section and/or gives a feeling of closure or finality, or series of cadences. Traditionally cadences act both harmonically to establish tonal centers and formally to articulate the end of sections, just as the tonic triad is harmonically central, a dominant-tonic cadence will be structurally central. The more powerful the cadence, the larger the section of music it can close. The strongest cadence is the perfect authentic cadence, which moves from the dominant to the tonic, most strongly establishes tonal center, and ends the most important sections of tonal pieces, including the final section. This is the basis of the "dominant-tonic" or "tonic-dominant" relationship. Common practice placed a great deal of emphasis on the correct use of cadences to structure music, and cadences were placed precisely to define the sections of a work. However, such strict use of cadences gradually gave way to more complex procedures where whole families of chords were used to imply particular distance from the tonal center. Composers, beginning in the late 18th Century began using chords (such as the Neapolitan, French or Italian Sixth) which temporarily suspended a sense of key, and by freely changing between the major and minor voicing for the tonic chord, thereby making the listener unsure whether the music was major or minor. There was also a gradual increase in the use of notes which were not part of the basic 7 notes, called chromaticism, culminating in post-Wagnerian music such as that by Mahler and Strauss and trends such as impressionism and dodecaphony.

Related Topics:
Cadence - 18th Century - Chromaticism - Wagnerian - Mahler - Strauss - Impressionism - Dodecaphony

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One area of disagreement, going back to the origin of the term tonality, is whether, and to what degree, tonality is "natural" or inherent in music, and whether, and to what degree, it is constructed by the composer, performer and listener. The arguments involved are too complex to summarize, and it is difficult to draw clear lines. There is also a disagreement as to how "natural" the practice of Western tonal harmony is versus other forms of harmony, and what grounds would prove or disprove this hypothesis. Since these arguments are often centered around what kind of music should be performed and taught, they often assume a vehemence or dogmatism which goes beyond the nominal issue of hearing and perception.

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