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Common Practice Period
Era of the tonal system between the mid-17th to early 20th centuries
In the history of European art music, the common practice period is the era of the tonal system. Though it has no exact dates, most features of the common-practice period persisted from the mid- to late baroque period, through the Classical, Romantic and Impressionist periods, from around 1650 to 1900. The period saw considerable stylistic evolution, with some patterns and conventions flourishing and then declining, for example the sonata form. Thus, the dates 1650-1900 are necessarily nebulous and arbitrary borders that depend on context. The most important unifying feature throughout the period is a harmonic language to which modern music theorists can apply Roman numeral chord analysis.
The harmonic language of this period is known as "common-practice tonality", or sometimes the "tonal system" (though whether tonality implies common-practice idioms is a question of debate). Common-practice tonality represents a union between harmonic function and counterpoint. In other words, individual melodic lines, when taken together, express harmonic unity and goal-oriented progression. In tonal music, each tone in the diatonic scale functions according to its relationship to the tonic (the fundamental pitch of the scale). While diatonicism forms the basis for the tonal system, the system can withstand considerable chromatic alteration without losing its tonal identity.
Throughout the common-practice period, certain harmonic patterns span styles, composers, regions, and epochs. Johann Sebastian Bach and Richard Strauss, for instance, may both write passages that can be analysed according to the progression I-ii-V-I, despite vast differences in style and context. Such harmonic conventions can be distilled into the familiar chord progressions with which musicians analyse and compose tonal music.
Various popular idioms of the twentieth century break down the standardized chord progressions of the common-practice period. While these later styles incorporate many elements of the tonal vocabulary (such as major and minor chords), the function of these elements is not necessarily rooted in classical models of counterpoint and harmonic function. For example, in common-practice harmony, a major triad built on the fifth degree of the scale (V) is unlikely to progress directly to a root position triad built on the fourth degree of the scale (IV), but the reverse of this progression (IV-V) is quite common. By contrast, the V-IV progression is readily acceptable by many other standards; for example, this transition is essential to the "shuffle" blues progression's last line (V-IV-I-I), which has become the orthodox ending for blues progressions at the expense of the original last line (V-V-I-I) (Tanner & Gerow 1984, 37).
Coordination of the various parts of a piece of music through an externalized metre is a deeply rooted aspect of common-practice music. Rhythmically, common practice metric structures generally include (Winold 1975, chapter 3):
Clearly enunciated or implied pulse at all levels, with the fastest levels rarely being extreme
Small or moderate duration complement and range, with one duration (or pulse) predominating in the duration hierarchy, are heard as the basic unit throughout a composition. Exceptions are most frequently extremely long, such as pedal tones; or, if they are short, they generally occur as the rapidly alternating or transient components of trills, tremolos, or other ornaments.
Rhythmic gestures of a limited number of rhythmic units, sometimes based on a single or alternating pair.
Thetic (i.e., stressed), anacrustic (i.e., unstressed), and initial rest rhythmic gestures are used, with anacrustic beginnings and strong endings possibly most frequent and upbeat endings most rare.
Rhythmic gestures are repeated exactly or in variation after contrasting gestures. There may be one rhythmic gesture almost exclusively throughout an entire composition, but complete avoidance of repetition is rare.
Composite rhythms confirm the metre, often in metric or even note patterns identical to the pulse on specific metric level.
Patterns of pitch and duration are of primary importance in common practice melody, while tone quality is of secondary importance. Durations recur and are often periodic; pitches are generally diatonic (Kliewer 1975, chapter 4).
Kliewer, Vernon (1975). "Melody: Linear Aspects of Twentieth-Century Music". In Aspects of Twentieth-Century Music, edited by Gary Wittlich, pp. 270-301. Englewood Cliffs, New Jersey: Prentice-Hall. ISBN0-13-049346-5.
London, Justin (2001). "Rhythm, §II: Historical Studies of Rhythm". The New Grove Dictionary of Music and Musicians, second edition, edited by Stanley Sadie and John Tyrrell. London: Macmillan Publishers.
Tanner, Paul, and Maurice Gerow (1984). A Study of Jazz. Dubuque, Iowa: William C. Brown Publishers. Cited in Robert M. Baker, "A Brief History of the Blues". TheBlueHighway.com.
Winold, Allen (1975). "Rhythm in Twentieth-Century Music". In Aspects of Twentieth-Century Music, edited by Richard Peter Delone and Gary Wittlich, Englewood Cliffs, New Jersey: Prentice-Hall. ISBN978-0-13-049346-0. pp. 208-269.