上句见：Day365
The Story of Philosophy《哲学的故事》第1章Plato第7节VI. The Psychological Solution第7段第1句：

Music and measure lend grace and health to the soul and to the body; but again, too much music is as dangerous as too much athletics. To be merely an athlete is to be nearly a savage; and to be merely a musician is to be "melted and softened beyond what is good"(410). The two must be combined; and after sixteen the individual practice of music but be abandoned, though choral singing, like communal games, will go on throughout life. Nor is music to be merely music; it must be used to provide attractive forms for the sometimes unappetizing contents of mathematics, history and science; there is no reason why for the young these difficult studies should not be smoothed into verse and beautified with song. Even then these studies are not to be forced upon an unwilling mind; within limits a libertarian spirit must prevail.
浙江大学译本：音乐和舞蹈使人身心健康、风度翩翩，然而，过多的音乐和过多的运动一样会带来危害。

解析

1、Music and measure lend grace and health to the soul and to the body;
音乐和韵律能赋予灵魂和身体优雅与健康；
"lend … to ...and to…"：这是平行结构，将Grace and health与“to the soul and to the body"形成对称表达。这句也应该可以拆成“lend grace to the soul and land health to the body”，但显然不好。一是少了grace and health这对类似尾韵的组合，二是不够精简。
2、but again, too much music is as dangerous as too much athletics.
然而，同样地，过度沉迷于音乐与过度进行体育运动一样危险。

段首都是很好的转场句，前面是承接上文讲音乐的作用，后面讲沉迷音乐也是相当危险的。很明显的观点句，看后面如何找理由。

音乐和韵律能赋予灵魂和身体优雅与健康；然而，同样地，过度沉迷于音乐与过度进行体育运动一样危险。