Ishaq b. Ibrahim al-Mawsili (772–850). In al-Isfahani's view, Ishaq b. Ibrahim was a multi-talented man, who excelled in a number of subjects, but, most importantly, music. Ishaq b. Ibrahim, as a collector of the reports about poets and singers, is an important source in his Aghānī. Besides being a mine of information, Ishaq b. Ibrahim's terminology for the description of the melodic modes is preferred over that of his opponent, Ibrahim ibn al-Mahdi (779–839), and adopted by al-Isfahani in his Aghani. Furthermore, al-Isfahani embarked on the compilation of the Aghānī because he was commissioned by his patron to reconstruct the list of the exquisite songs selected by Ishaq. In other words, the raison d’etre of the Aghānī is partly related to al-Isfahani's idol, Ishaq b. Ibrahim, and its information about singers, songs and performance owes a tremendous amount to him. Al-Isfahani's admiration for scholars or men of letters can be detected from time to time, usually in the passing comments in the chains of transmission. Yet al-Isfahani outspokenly expresses his admiration, in some cases, such as that of Ibn al-Muʿtazz (862–909). As an Umayyad by ancestry, al-Isfahani's later biographers mention his Shi'i affiliation with surprise. Yet, in the light of the history of the family's connections with the Abbasid elite of Shi'i inclination and the Ṭālibids, and of his learning experience in Kūfa, his Shi'i conviction is understandable. Al-Tusi (995–1067) is the only early source specifying the exact sect to which al-Isfahani belonged in the fluid Shi'i world: he was a Zaydī. Although al-Ṭūsī's view is widely accepted, its veracity is not beyond doubt. Al-Isfahani does not seem to have been informed of the latest Zaydī movements in Yemen and Ṭabaristān during his life, while his association with the Kūfan Zaydī community, which to some degree became less distinguishable from the Sunnīs, is yet to be studied in depth. It is clear, based on examination of how al-Isfahani amended the reports at his disposal, that he honoured Ali, who played a far more prominent role in his works than the first three caliphs, and some of his descendants, including Zaydi Shi'ism's eponym, Zayd ibn Ali (694–740), by presenting them positively, while, in some cases, leaving their enemies’ rectitude in question. In spite of that, al-Isfahani is neither keen to identify the imams in the past, nor discuss the qualities of an imam.{{efn|The Zaydī writings in the late ninth and early