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The sanshin (三線, literally "three strings") is an Okinawan musical instrument and precursor of the Japanese shamisen. Often likened to a banjo, it consists of a snakeskin-covered body, neck and three strings.
Its close resemblance in both appearance and name to the Chinese sanxian suggests its Chinese origins, the old Ryūkyū Kingdom (pre-Japanese Okinawa) having very close ties with China. In the 16th century, the sanshin reached the Japanese trading port at Sakai in Osaka, Japan. In mainland Japan, it evolved into the larger shamisen.
In mainland Japan, many people refer to the sanshin as jabisen (蛇皮線, literally "snake-skin strings") or jamisen (蛇三線, "snake three strings") because the body of the instrument has a snakeskin covering. Traditionally, it was covered with the skin of the Burmese python, but today, due to CITES regulations, the skin of the python reticulatus is also used. A bamboo bridge raises the strings off the skin.
The Okinawan names for the strings are (from thick to thin) uujiru (男絃, "male string"), nakajiru (中絃, "middle string"), and miijiru (女絃, "female string"). The strings are white, except in Amami, where they are yellow.
Traditionally, players wore a plectrum, made of a material such as the horn of the water buffalo, on the index finger. Many still do, whereas others use a guitar pick or the nail of the index finger. In Amami, long, narrow bambooplectra are also used, and the strings are yellow and thinner, which allow a higher-pitched tone than that of the Okinawa sanshin. In Amami, the sanshin is called shamisen 三味線.
Due to international wildlife protection treaties, it is not legal to export snakeskin-covered sanshins to some countries (such as the United Kingdom and United States). There is some room for interpretation of this in that the treaties specify that the restriction is for endangered species of snake while the sanshins generally use the skin of the habu, which is not an endangered species.
Sanshin tuning 
The sanshin has five tunings called chindami (ちんだみ):
- Hon chōshi (本調子) – "standard tuning" (i.e. C3, F3, C4 expressed in terms of scientific pitch notation)
- Ichi-agi chōshi (一揚調子) – "first-string raised tuning" (i.e. E♭3, F3, C4)
- Ni-agi chōshi (二揚調子) – "second-string raised tuning" (i.e. C3, G3, C4)
- Ichi, ni-agi chōshi (一、二揚調子) – "first- and second-strings raised tuning" (i.e. D3, G3, C4)
- San-sage chōshi (三下げ調子) – "third-string lowered tuning" (i.e. C3, F3, B♭3)
See also 
- 滝原, 康盛 (1964). Ryūkyū minyō kunkunshi 琉球民謡工工四. Ryūkyū ongaku gakufu kenkyūsho 琉球音楽楽譜研究所, Naha, Okinawa.
- Simple Sanshin Source - An English-written guide to the sanshin.
- iSanshin - Sanshin Application on iPhone/iPodtouch
- Tuning - Sanshin Tuning Guide