Erhu

The erhu is a two-stringed bowed musical instrument, more specifically a spike fiddle, which may also be called a "southern fiddle", and sometimes known in the Western world as the "Chinese violin" or a "Chinese two-stringed fiddle". It is used as a solo instrument as well as in small ensembles and large orchestras. It is the most popular of the huqin family of traditional bowed string instruments used by various ethnic groups of China. A very versatile instrument, the erhu is used in both traditional and contemporary music arrangements, such as in pop, rock, jazz.

The erhu consists of a long vertical stick-like neck, at the top of which are two large tuning pegs, and at the bottom is a small resonator body (sound box) which is covered with python skin on the front (playing) end. Two strings are attached from the pegs to the base, and a small loop of string (qian jin) placed around the neck and strings acting as a nut pulls the strings towards the skin, holding a small wooden bridge in place.



Picture showing bow hair in between the two strings.

The erhu has some unusual features. First is that its characteristic sound is produced through the vibration of the python skin by bowing. Second, there is no fingerboard; the player stops the strings by pressing their fingertips onto the strings without the strings touching the neck. Third, the horse hair bow is never separated from the strings (which were formerly of twisted silk but which today are usually made of metal); it passes between them as opposed to over them (the latter being the case with western bowed stringed instruments). Lastly, although there are two strings, they are very close to each other and the player's left hand in effect plays as if on one string. The inside string (nearest to player) is generally tuned to D4 and the outside string to A4, a fifth higher. The maximum range of the instrument is three and a half octaves, from D4 up to A7, before a stopping finger reaches the part of the string in contact with the bow hair. The usual playing range is about two and a half octaves.
Various dense and heavy hardwoods are used in making the erhu. According to Chinese references the woods include zi tan (紫檀 red sandalwood and other woods of the genus Pterocarpus such as padauk), lao hong mu (老红木 aged red wood), wu mu (乌木 black wood), and hong mu (红木 red wood). Particularly fine erhus are often made from pieces of old furniture. A typical erhu measures 81 cm from top to bottom, the length of the bow also being 81 cm.

The erhu is almost always tuned to the interval of a fifth. The inside string (nearest to player) is generally tuned to D4 and the outside string to A4. This is the same as the two middle strings of the violin. The erhu is played sitting down, with the sound box placed on the top of the left thigh and the neck held vertically. However, performers of more recent years have played while standing up using a specially developed belt-clip.

The bow is held with an underhand grip. The bow hair is adjusted so it is slightly loose. The fingers of the right hand are used to push the hairs away from the stick in order to create tension in the hairs. The bow hair is placed in between the two strings and both sides of the bow hair are used to produce sound, the player pushes the bow away from the body when bowing the A string (the outside string), and pulls it inwards when bowing the "inside" D string.
Aside from the usual bowing technique used for most pieces, the erhu can also be plucked, usually using the second finger of the right hand. This produces a dry, muted tone (if either of the open strings is plucked, the sound is somewhat more resonant) which is sometimes desired in contemporary pieces. The left hand alters the pitch of the strings by pressing on the string at the desired point. As the instrument has no frets, the tone is slightly muddled, but resonant. Techniques include hua yin (slides), rou xian (vibrato), huan ba (changing positions).