It has such a contented sound.

Richard made a small, contented sound.

It seemed almost a contented sound.

Everywhere there was the hum of industry, a contented sound like the buzzing of bees intent upon gathering honey.

She nuzzled him and ejected a contented sound from her throat as she so obviously took in his scent down the length of his neck.

She must have felt it, too, for contented sounds came from behind her lips, and I pulled her nearer still.

"It is the most contented sound in the world."