Alessandro Costantini (c. 1581–1583 in Staffolo – 20 October 1657 in Rome) was an Italian baroque composer, maestro di cappella at the Collegium Germanicum. His surviving works include several Latin motets.Festschrift Karl Gustav Fellerer to his 60th birthday; Heinrich Hüschen, Karl Gustav Fellerer, 1962 Musik, Series II: Landschaftsdenkmale der Musik: Bayern, vol. 1, "4. Alessandro Costantini: 'Pastores loquebantur'", Mainz: Schott 1936 (Canticum vetus 11)
He and his brother, the composer , were pupils of Giovanni Bernardino Nanino. His brother-in-law was the countertenor , whose sons, the composers Vincenzo Albrici and , were his nephews.
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