Kīrtanam means preaching, chanting. Kīrtanam. Śravaṇaṁ kīrtanaṁ viṣṇoḥ (SB 7.5.23).
So that is our main business from the very beginning of life. Kaumāra ācaret prājño dharmān bhāgavatān iha (SB 7.6.1). This human form of life is so rare, after many, many millions of birth, many many millions of years rotating through different species of life, by the evolutionary process, we have come to this human form of life. In this life also, if you are simply engaged in the matter of eating sleeping, sense gratification, and defending, then where is the advancement? No advancement. So that inquiry should be there, that "What I am? What I am put into these tribulations of conditional life under the laws of nature?" Unless this question arises in one's mind, he's not a human being. He's animal.