A rite of mourning for a deceased person. During the mourning period, the deceased person's good deeds are remembered. Mourning lasts until the anniversary of the death. Estirtu - notification of the death of a relative, Kazakh ceremonial song. This type of musical folklore of Kazakhs is preserved only among old residents living in villages of Mangistau, East Kazakhstan, South Kazakhstan, Kyzylorda, Almaty, Zhambyl regions.

Estirtu is considered a very responsible thing among Kazakhs. Even such significant events as “Notification of the death of Bogenbai batyr to Abylai khan”, “Notification of Tezek Tore about the death of Shokan to Chingiz khan”, “Notification of poet Abil about the death of Suyinkara” were remembered in history, in the minds of people by poems. Zhoktau is a mourning song, in the customs of the Kazakh people a mourning song is recited from the day of a person's death until the anniversary of his death has passed.