Berkeley Divinity School affiliated with Yale Divinity School in 1971, and in the same year the university replaced the B.D. with a Master of Divinity (M.Div.) program. While Berkeley retains its Episcopal Church connection, its students are admitted by and fully enrolled as members of Yale Divinity School. The Jonathan Edwards Center at Yale University, a division of the Divinity School, maintains a large collection of primary source materials about Jonathan Edwards, a 1720 Yale alumnus. The Yale Institute of Sacred Music (ISM) is jointly-affiliated with the Divinity School and School of Music. It offers programs in choral conducting, organ performance, voice, and church music studies, and in liturgical studies and religion and the arts.