Classical music helps in civilizing children by making their behavior more graceful.

civilizing 是动词 civilize 的现在分词形式。civilize 由词根 civil（文明的）和后缀 -ize（使...化）组成，意思是"使文明化、教化"。在句中表示"通过古典音乐使孩子们变得更有教养"这一持续过程。