 In Presbyterian churches that worship in the historical fashion (i.e., sing a cappella; see Presbyterian worship), a precentor is a person (man or woman, not necessarily clergy) who leads the singing, often by means of conducting techniques, but sometimes just by singing from amongst the congregation.Churches that use a repeat-after-me manner of singing called lining out (used primarily when sufficient numbers of psalm books are unavailable, or the congregation insufficiently literate, as was the case in the black church in Harper Lee's "To Kill a Mockingbird") are usually led by the precentor, much as with other non-instrumental churches.The title "precentor" is also used at two English public schools, Radley College and Eton College, and a private school in Sri Lanka, S. Thomas' College, Mount Lavinia, to refer to the head of music.