I kept on hearing this song whilst in China. I traveled a lot in the Tibetan Prefecture. This is a Tibetan Song, with English subtitles. I finally understand what the song is about ;p

“Sun sets behind the southern mountains,
The white moon gets consumed by the clouds,
And the stars have fallen amid rain and clouds.
Heart saddens; unable to meet you there,
Heart saddens, unable to meet you there,”

It’s a spiritual song about how he cannot see the Lama, the Tibetan teacher of the Dharma.