General Characteristics
Common practice music obeys two different kinds of musical norms: first, it uses conventionalized sequences of chords, such as I-IV-V-I. (see Roman numeral analysis) Second, it obeys specific contrapuntal norms, such as the avoidance of parallel fifths and octaves.
Common practice music can be contrasted with the earlier modal music and later atonal music. It can also be contrasted with twentieth-century styles, such as rock and jazz, that are broadly tonal but do not obey the harmonic and contrapuntal norms described in the preceding paragraph. Nevertheless, there are often significant similarities between the music of the common practice period and the broadly tonal music of the twentieth century.
Read more about this topic: Common Practice Period
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