YOU SAID:
A soothing lullaby is sung in a calming voice that puts the target into a deep slumber.
INTO JAPANESE
落ち着いた子守歌は、目標を深い眠りに置く落ち着いた声で歌われます。
BACK INTO ENGLISH
A calm lullaby is sung with a calm voice that places the goal in a deep sleep.
You've done this before, haven't you.