Abu al-Faraj al-Isfahani had a wide range of scholarly interests and devoted considerable time to the study of ancient history, genealogy, philology, and poetry. He spent almost 50 years on his major work, The Book of Songs (Kitab al-agani, 21 volumes in the 1904 Cairo edition). An enormous anthology of poetry from the seventh through the tenth century in both Arabic and Arabic dialects, it contains biographical information on the poets and a variety of historical and cultural material. He compiled divans by the poets Abu Tammam, al-Buthturi, and Abu Nuwas. His historical works have not survived.
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