Also known as sangen, the Chinese sanxian, made its way via Okinawa to Japan. As per the name, has three strings and in China and Okinawa were covered in snake skin, while on mainland Japan, cat and dog skin is used. While only used in Japan since modern times, from kabuki theatre, puppet plays and other such theatre music, accompaniment to singing, and folk songs from many regions, the shamisen is widely loved.
There are a variety of standard shamisen which vary according to genre from hosozao (thin neck) to futazao (thick neck) and also a diverse range of bachi, plectrums, and koma, bridges. Also characteristic is the formation of a lingering resonance called sawari, from the string lightly touching the surface of the neck, when striking the strings, knocking the plectrum on the skin. A diverse range of tunings, based on the perfect fourth and perfect fifth combined hon-chōshi tuning, including the second string raised one tone, ni-agari and the third string lowered one tone, san-sagari.
Moreover, the reference tone can be configured to suite a singer or other instruments. But it is usual to choose between h (si) and d (re) and regardless of the real pitch when the Western five-lined staff notation is used, h is often used for the first string.
Performance by Yōko Kimura, Tetsuya Nozawa
In each episode, when staff notation is applicable, it is standardized by absolute pitch notation.