The Center's flagship piece of equipment, the RCA Mark II Sound Synthesizer, was delivered in 1957 after it was developed to Ussachevsky and Babbitt's specifications. The RCA (and the Center) were re-housed in Prentis Hall, a building off the main Columbia campus on 125th Street. A number of significant pieces in the electronic music repertoire were realized on the Synthesizer, including Babbitt's "Vision and Prayer" and Charles Wuorinen's "Time's Encomium", which was awarded the 1970 Pulitzer Prize in Music. In 1961 Columbia Records released an album titled simply "Columbia-Princeton Electronic Music Center", which was produced principally on the RCA synthesizer.