Rostam Batmanglij is an American musician. He is known as Rostam and is a founding member of Vampire Weekend. He has released solo albums Half-Light, Changephobia, and an album with Hamilton Leithauser titled I Had a Dream That You Were Mine. He has also released the song Bike Dream. Rostam has collaborated across pop, rock, and electronic music genres, working as an in-demand producer with Carly Rae Jepsen, Charli XCX, Ra Ra Riot, and Haim. His most popular songs include Half-Light and In a Blackout.