The harp, _chang_, in olden time a favourite instrument of the Persians, has gradually fallen into desuetude. A small harp is represented in the celebrated sculptures which exist on a stupendous rock, called Tak-i-Bostan, in the vicinity of the town of Kermanshah. These sculptures are said to have been executed during the lifetime of the Persian monarch Chosroes II. (591-628). They form the ornaments of two lofty arches, and consist of representations of field sports and aquatic amusements. In one of the boats is seated a man in an ornamental dress, with a halo round his head, who is receiving an arrow from one of his attendants; while a female, who is sitting near him, plays on a Trigonon. Towards the top of the bas-relief is represented a stage, on which are performers on small straight trumpets and little hand drums; six harpers; and four other musicians, apparently females――the first of whom plays a flute; the second, a sort of Pandean pipe; the third, an instrument which is too much defaced to be recognisable; and the fourth, a bagpipe. Two harps of a peculiar shape were copied by Sir Gore Ousely from Persian manuscripts about four hundred years old, resembling, in the principle on which they are constructed, all other oriental harps. There existed evidently various kinds of the _chang_. It may be remarked here that the instrument _tschenk_ (or _chang_) in use at the present day in Persia, is more like a dulcimer than a harp. The Arabs adopted the harp from the Persians, and called it _junk_. The Persians appear to have adopted, at an early period, smaller musical intervals than semitones. When the Arabs conquered Persia (A.D. 641) the Persians had already attained a higher degree of civilisation than their conquerors. The latter found in Persia the cultivation of music considerably in advance of their own, and the musical instruments superior also. They soon adopted the Persian instruments, and there can be no doubt that the musical system exhibited by the earliest Arab writers whose works on the theory of music have been preserved was based upon an older system of the Persians. In these works the octave is divided in seventeen _one-third-tones_――intervals which are still made use of in the East. Some of the Arabian instruments are constructed so as to enable the performer to produce the intervals with exactness. The frets on the lute and tamboura, for instance, are regulated with a view to this object.