![]() 18) but Wagner's use was significant, first because it is seen as moving away from traditional tonal harmony and even towards atonality, and second because with this chord Wagner actually provoked the sound or structure of musical harmony to become more predominant than its function, a notion which was soon after to be explored by Debussy and others ( Erickson 1975, ). The chord had been found in earlier works ( Vogel 1962, 12 Nattiez 1990, ) (notably Beethoven's Piano Sonata No. This layering of fourths in this context has been seen as highly significant. The bottom two notes make up an augmented fourth the upper two make up a perfect fourth. The Tristan chord is made up of the notes F ♮, B ♮, D ♯ and G ♯ and is the very first chord heard in Wagner's opera Tristan und Isolde. Quartal harmony was developed in the early 20th century as a result of this breakdown and reevaluation of tonality. ![]() In the later 19th century, during the breakdown of tonality in classical music, all intervallic relationships were once again reassessed. During the common practice period (between about 16), this interval came to be heard either as a dissonance (when appearing as a suspension requiring resolution in the voice leading) or as a consonance (when the tonic of the chord appears in parts higher than the fifth of the chord). In the Middle Ages, simultaneous notes a fourth apart were heard as a consonance. The question of which strategy of analysis is advisable is hard to answer since it is refined by the particular details: given one interpretation, and the progression of harmony through the preceding and following chords, and the overall musical development, is there a comprehensible and audibly functional meaning to the interpretation? It is important to question whether these suspensions, chromatic chords and altered chords are resolved as part of the functional harmony or whether they remain non-functional and unresolved. ![]() ![]() Traditional resolution of suspensions to a major triad and to a minor triad Play ( help ![]()
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