For Mandarin :
《她来听我的演唱会》 by 张学友(Jacky Cheung)
The lyric of the song is impressive
music link :
http://www.kugou.com/song/#732EF5928CC89FAD4491CA6E03C0D624
For Cantonese :
《伤逝》 by 叶倩文(Sally Yeh)
music link :
http://www.kugou.com/song/#3EEF65501496CB63B252B07DB25F4B8C
Enjoy the music !