Peking opera
Song

There are six main types of song lyrics in Peking opera: emotive, condemnatory, narrative, descriptive, disputive, and "shared space separate sensations" lyrics. Each type uses the same basic lyrical structure, differing only in kind and degree of emotions portrayed. Lyrics are written in couplets (lian) consisting of two lines (ju). Couplets can consist of two ten character lines, or two seven character lines. The lines are further subdivided into three dou (lit. "pause"), typically in a 3-3-4 or 2-2-3 pattern. Lines may be "padded" with extra characters for the purpose of clarifying meaning. Rhyme is an extremely important device in Peking opera, with thirteen identified rhyme categories. Song lyrics also use the speech tones of Mandarin Chinese in ways that are pleasing to the ear and convey proper meaning and emotion. The first and second of Chinese's four tones are normally known as "level" (ping) tones in Peking opera, while the third and fourth are called "oblique" (ze). The closing line of every couplet in a song ends in a level tone.

Songs in Peking opera are proscribed by a set of common aesthetic values. A majority of songs are within a pitch range of an octave and a fifth. High pitch is a positive aesthetic value, so a performer will pitch songs at the very top of their vocal range. For this reason, the idea of a song's key has value in Peking opera only as a technical tool for the performer. Different performers in the same performance may sing in different keys, requiring the accompanying musicians to constantly retune their instruments or switch out with other players. Elizabeth Wichmann describes the ideal basic timbre for Peking opera songs as a "controlled nasal tone". Performers make extensive use of vocal vibrato during songs, in a way that is "slower" and "wider" than vibrato used in Western performances. The Peking opera aesthetic for songs is summed up by the expression zi zheng qiang yuan, meaning that the written characters should be delivered accurately and precisely, and the melodic passages should be weaving, or "round".
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