Arched harps is a category in the Hornbostel-Sachs classification system for musical instruments, a type of harp. The instrument may also be called bow harp. With arched harps, the neck forms a continuous arc with the body and has an open gap between the two ends of the arc (open harps).
Arched harps are probably the most ancient form of the harp, evolving from the musical bow. The first bowed harps appeared around 3000 B.C. in Iran and Mesopotamia and then in Egypt. India may have had the instrument as early as Mesopotamia.
The horizontal arched-bow from Sumeria spread west to ancient Greece, Rome and Minoan Crete and eastward to India. Like Egypt, however, India continued to develop the instrument on its own; undated artwork in caves shows a harp resembling a musical bow, with improvised resonators of different shapes and different numbers of added strings.
When the angular harp replaced the arched harp about 2000 B.C. in the Middle East and spread along the Silk Road, the arched harp was retained in India until after 800 A.D. (a form of ancient vina), and in Egypt until the Hellenistic Age (after 500 B.C). It can still be found today in Sub-Saharan Africa.
From India the arched harp was introduced into Malaysia, as well as Champa and Burma (as early as 500 A.D.) where it is still played under the name of saung, and in 7th-century A.D. Cambodia as the pin
Bhuddists were involved with the spread of the arched harp in Asia. Artwork depicting the arched harp that survived in China, Malaysia, Indonesia, Burma, and Cambodia comes from Buddhist communities. The harp disappeared in India about the time when Hinduism displaced Buddhism. The Buddhists took the harp north from India along the silk road to China, where it was painted in the Mogao Caves and Yulin Grottos. Additionally, Buddhist Burma sent two types of harp to Chinese court to perform, including the phoenix-headed harp. The latter became known in China as the Phoenix-headed konghou.
Portable bowed harps may have made their way from Egypt up the Nile to East Africa and, branching off from this route, also to Central and West Africa.