In Performance: Caroline Shaw "I don't really call myself a composer," Caroline Shaw told Zachary Woolfe, writing for The Times, despite the fact that she won the 2013 Pulitzer Prize in Music for "Partita for Eight Voices," a vocal work that Mr. Woolfe described as a "dazzling, emotionally generous take on a Baroque dance suite." Indeed, Ms. Shaw is a seemingly tireless performer, working as a violinist with the American Contemporary Music Ensemble and as an alto in vocal ensembles like the Trinity Choir and Roomful of Teeth - which performed "Partita" in its premiere in November at Le Poisson Rouge. She is scheduled to perform with the American Contemporary ensemble and with Roomful of Teeth in February. Here, Ms. Shaw performs an improvisational work with violin, voice and a loop station.