of information by many Shi'i and non-Shi'i compilers of the following centuries. The Kitab al-Aghani, al-Isfahanis best known work, is an immense compilation, including songs provided with musical indications (melodic modes and meters of songs), the biographies of poets and musicians of different periods in addition to historical material. As noted above, al-Isfahani embarks on compiling the Aghani first under the command of a patron, whom he calls ra'is (chief), to reconstruct the list of one hundred fine songs, selected by Ishaq b. Ibrahim. Due to an obscure report in Yaqut's Mu'jam, this raʾīs is often assumed to be Sayf al-Dawla al-Ḥamdānī (r. 945–967), but recent studies suggest that a more plausible candidate for the dedication of the Aghani is the vizier al-Muhallabī. The Aghani is divided into three parts: first, The Hundred Songs (al-mi'a al-ṣawt al-mukhtara) and other song collections; second, the songs of the caliphs and of their children and grandchildren (aghani al-khulafa wa-awladihim wa-awlad awladihim); and third, al-Isfahanis selection of songs. The articles in each part are arranged based on different patterns, but it is mostly the song which introduces the articles on biographies or events. The Kitab al-Aghani is not the first book or collection of songs in Arabic, but it can be asserted that it is the most important one, for it "is a unique mine of information not only on hundreds of song texts with their modes and meters, but also on the lives of their poets and composers, and on the social context of music making in early Islam and at the courts of the caliphs in Damascus and Baghdad". Because of al-Isfahani's pedantic documentation of his sources, the Kitab al-Aghani can also be used to reconstruct earlier books of songs or biographical dictionaries on musicians that are otherwise lost. As for the works that did not survive, based on their contents, as implied by their titles, they can be divided into the following categories: The genealogical works: Nasab Bani Abd Shams ("The Genealogy of the Banu Abd Shams"), Jamharat al-nasab ("The Compendium of Genealogies"), Nasab Bani Shayban ("The Genealogy of the Banu Shayban"), and Nasab al-Mahaliba ("The Genealogy of the Muhallabids"), this last probably dedicated to his patron, the vizier al-Muhallabi. The reports about specified or unspecified topics, such as Kitab al-Khammarin wa-l-khammarat ("The Book of Tavern-Keepers, Male and Female"), Akhbar al-tufayliyin ("Reports about Party Crashers"), al-Akhbar wa-l-nawadir ("The Reports and Rare