《塑料树的插曲是什么歌？谁唱的？哪里可以下载？

我也在找，这是我在别的地方看到的，但是没有试听下载地址
全部的歌词如下：

Lovers
Music by Francis Lai. Lyrics by Nick Hamilton

Lovers in the sunshine laughing at each other
Walking by
Children on the water singing to the skylark
Flying high.
Nothing lasts forever no one ever knows the reason why.

Summer passed so quickly song become a memory
Lost in time
Photos of the moments that should last forever
Left behind
But nothing last forever no one ever knows the reason why.

Long lonely nights, I dream of you, I call your name
I close my eyes, but nothing's changed.

Long lonely nights, I hear you cry, you call my name
You close your eyes but things don't change on lover's nights.

Smiling at the morning dancing on your pillow
For a while
All your fears forgotten hidden in the corners
Of your mind
But nothing last forever no one ever knows the reason why.