chant

(noun) a repetitive song in which as many syllables as necessary are assigned to a single tone.

(verb) recite with musical intonation; recite as a chant or a psalm. Synonyms: intone, intonate, cantillate. Example: "The rabbi chanted a prayer."

(verb) utter monotonously and repetitively and rhythmically. Synonyms: tone, intone. Example: "The students chanted the same slogan over and over again."