Symphonic Choirs is a vocal synthesizer and vocal library software created by EastWest, designed to imitate an entire vocal choir. The content was created by producers Doug Rogers and Nick Phoenix with recording engineer Keith O. Johnson for EastWest. Recorded in a real concert hall, the software initially had two styles of producing a result, the first being the "PLAY" engine version and the second being the "WordBuilder". The WordBuilder works by the user typing in what they want the software to recreate and it playing back the words.