歌声消失之后
[gē shēng xiāo shī zhī hòu]
'After the Song Has Faded', evoking feelings of melancholy or remembrance about the past times full of music, possibly implying that the joy or happiness (that came along with the song or singing) no longer exists. One who selects this kind of internet name probably has some memories that they treasure but have faded away over time, and there's a longing sentiment mixed with bittersweet thoughts towards it.