All songs send positive thoughts and messages to listeners, although sometimes you really have to read between the lines to understand this profound message.

read 的基本意思是"阅读"，在这里引申为"理解、解读"。 between 的意思是"在...之间"。 the 是定冠词，特指后面的名词。 lines 是 line 的复数形式，line 在这里指"文字的行"。 read between the lines 是一个固定短语，字面意思是"阅读字里行间"，实际含义是"理解言外之意"或"领会隐含的意思"。