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			The accompaniment for a Beijing opera performance usually consists of a small ensemble of traditional melodic and percussion instruments. The lead melodic instrument is the jinghu, a small high pitched two string spike fiddle. The jinghu is the primary accompaniment for performers during songs. Accompaniment is heterophonic - the jinghu player follows the basic contours of the song's melody, but diverges in pitch and other elements. The jinghu often plays more notes per measure than the performer sings, and does so an octave lower. During rehearsal, the jinghu player adopts his or her own signature version of the song's melody, but also must adapt to spontaneous improvisations on the part of the performer due to changed performance conditions. Thus, the jinghu player must have an instinctive ability to change his or her performance without warning to properly accompany the performer. The second is the circular bodied plucked lute, the yueqin. Percussion instruments include the daluo, xiaoluo, and naobo. The player of the gu and ban, a small high pitch drum and clapper, is the conductor of the entire ensemble. The two main musical styles of Beijing opera, Xipi and Erhuang, originally differed in subtle ways. In the Xipi style, the strings of the jinghu are tuned to the keys of A and D. The melodies in this style are very disjointed, possibly reflecting the style's derivation from the high and loud melodies of the Qinqiang opera of northwestern China. It is commonly used to tell joyous stories. In Erhuang, on the other hand, the strings are tuned to the keys of C and G. This reflects the low, soft, and despondent folk tunes of south-central Hubei province, the style's place of origin. As a result, it is used for lyrical stories. Both musical styles have a standard meter of two beats per bar. The two musical styles share six different tempos, including manban (a slow tempo), yuanban (a standard, medium-fast tempo), kuai sanyan ("leading beat"), daoban ("leading beat"), sanban ("rubato beat"), and yaoban ("shaking beat"). The xipi style also utilizes several unique tempos, including erliu ("two-six"), and kuaiban (a fast tempo). Of these tempos, yuanban, manban, and kuaiban are most commonly seen. The tempo at any given time is controlled by a percussion player who acts as director. Erhuang has been seen as more improvisational, and Xipi as more tranquil. The lack of defined standards among performance troupes and the passage of time may have made the two styles more similar to each other today. The melodies played by the accompaniment mainly fall into three broad categories. The first is the aria. The arias of Beijing opera can be further divided into those of the Erhuang and Xipi varieties. An example of an aria is wawa diao, an aria in the Xipi style that is sung by a young Sheng to indicate heightened emotion. The second type of melody heard in Beijing opera is the fixed-tune melody, or qupai. These are instrumental tunes that serve a wider range of purposes than arias. Examples include the "Water Dragon Tune" (shui long yin), which generally denotes the arrival of an important person, and "Triple Thrust"(ji san qiang), which may signal a feast or banquet.[76] The final type of musical accompaniment is the percussion pattern. Such patterns provide context to the music in ways similar to the fixed-tune melodies. For example, there are as many as 48 different percussion patterns that accompany stage entrances. Each one identifies the entering character by his or her individual rank and personality.
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