顶一楼的,blue在这个句子里表示“忧郁”.
整句话的翻译如下：-
轻柔的歌曲有时会让人坠入忧郁中.
例句：
I was really feeling blue after she told me she was leaving.
(她告诉我她即将离开之后,我真的感到很忧郁）