I / incentor
noun

incentor

gen. incentōris · gender masculine · decl. 3rd
one who sets the tune; begins to sing; a precentor
one who sets the tune or begins to sing, a precentor, singer (post-class.).
Lit.: carminis, Paul. Nol. Carm. 15, 32: incentore canam Phoebo Musisque magistris, Avien. Perieg. 895; Isid. 6, 9, 13.—
an inciter; exciter figuratively
Trop., an inciter, exciter: igneus turbarum, Amm. 15, 1, 2: civilis belli, Oros. 5, 19: rebellionis totius, id. 6, 11.