Bipa
The bipa is a pear-shape lute that is a traditional Korean musical instrument. It has the same Central Asian roots as the Chinese "pipa" and was introduced through the Silk Road to Goguryeo and Silla. There are two major types of "bipa": the four stringed "dang-bipa" (당비파 / 唐琵琶) and the five stringed "hyang-bipa" (향비파 / 鄕琵琶). While "dang-bipa" was a Tang-style pipa first introduced from the Chinese Tang dynasty and localized over time to have Korean characteristics, "hyang-bipa" was created in the Korean Kingdom of Silla. The instrument is also related to other derivatives  such as Vietnamese "đàn tỳ bà" and the Japanese "biwa". The bipa was popular in court music until it fell out of use in the early 20th century during the Japanese Colonial period. In 1988/89, there was the first attempt to revive the two "bipa" that was unsuccessful in commercialization. This revived "bipa" used the existing modern Chinese pipa as a basis but was modified to the Korean form, and followed Joseon style and Chinese style use of fake nails and Chinese techniques. It also reintroduced the two sound holes on the front characteristic of the two Korean "bipa" as  well as the five strings characteristic of the "hyang"-"bipa". The strings used are of twisted silk, rather than the metal-nylon used for the Chinese pipa. Following this recreation, there were many reinvented modern "bipa". A more faithful restoration of the two "bipa" is used in contemporary traditional music. In 2007, restoration by National Gugak Center of South Korea followed closely to the two original "bipa" from Akhak-Gwebeom , not made like the Chinese pipa. This recreation uses silk strings and is plucked with bare fingers or with a stick. This is used for traditional music and sanjo. Bipa The