 Chichester Cathedral Choir consists of eighteen choristers and four probationers, all of whom are educated at the Prebendal School (which sits adjacent to the Cathedral precinct and is the Cathedral Choir School), and six lay vicars, who are professional musicians.During school term the cathedral choir sing at eight services each week.As well as singing, choristers learn the piano and an orchestral instrument, spending at least eighteen hours a week on musical performance.