Lewis & Short

praecentor, ōris, m. [praecino], a leader in music, precentor (post-class.): praecentor in choris, App. Mund. p. 74, 3; cf.: praecentor qui vocem praemittit (opp. succentor), Aug. Enarr. in Psa. 87; cf. Isid. 7, 12, 27.