In an article written in 1926 on “Byzantine Musical Instruments in the Ninth Century” I mentioned that one of the earliest extant accounts in Arabic of the musical instruments of the Arabs and their neighbours is contained in an oration delivered by Ibn Khurdādhbih before Al-Mu'tamid (870–93). The narration appears in the Murūj al-dhahab of Al-Mas'ūdī (d. c. 956). Both of these writers were competent, to some extent, to deal with the question in its general aspect, and for that reason the recital has an added interest. Ibn Khurdādhbih had been taught music by the famous Isḥāq al-Mauṣilī (767–850), who was his father's personal friend. By his books, and by other means, some historical details of music and musicians were preserved, and they have been cited by later writers. Some of this information has, however, been challenged more than once by the author of the Kitāb al-aghānī, who censures Ibn Khurdādhbih for his mere conjectures, and for making statements without sufficient authority. Yet it may be presumed that the details given by Al-Mas'ūdī on the authority of Ibn Khurdādhbih may be trusted. The former, who had the highest opinion of the latter, would scarcely have quoted him at such length without reservations had he not approved. Al-Mas'ūdī was a great traveller and observer, and he had himself dealt with the music and musical instruments of the Arabs, Greeks, Byzantines, Syrians, Nabatseans, Indians, Persians, and others in his various works. If Ibn Khurdādhbih had erred, “the Imām of the historians,” as Ibn Khaldūn has called Al-Mas'ūdī, would assuredly have corrected him.