Rostam Batmanglij (Persian: رستم باتمانقلیچ‎, IPA: [rosˈtæm bɒːtmɒːŋɢeˈliːdʒ]; born November 28, 1983), known mononymously as Rostam, is an American songwriter, composer, producer, and multi-instrumentalist of electro-soul group Discovery, and formerly of New York City-based indie rock band Vampire Weekend.