4 adjectives to describe singsong

Except for the breach by which they had entered, the blotched and spotted compound walls stood ruinous yet high, shutting out all but a rising slant of sunlight, and from some outpost line of shops, near by, the rattle of an abacus and the broken singsong of argument, now harsh, now drowsy.

Then, in a moment, it seemed to me that I could hear some faint, monotonous singsong rising above all the rest.

Then, in a moment, it seemed to me that I could hear some faint, monotonous singsong rising above all the rest.

At once a muballir* on his left opened a copy of the Koran on a cushion on his lap and began to read from it in a nasal singsong.

4 adjectives to describe  singsong