Intonate
Part of speech: verb
Definition: To intone; to utter. To thunder or to utter in a sonorous or thunderous voice.
Chant
Part of speech: verb
Definition: To sing, especially without instruments, and as applied to monophonic and pre-modern music.
Part of speech: noun
Definition: Type of singing done generally without instruments and harmony.
Example sentence: I have watched Muslims chant 'Death to America!' on the streets of Tehran, then privately beg me to help them get a visa to the United States.