dé / zhī / zhì / yǒu / qù / shì / de / xiāo / xi / ， / tā / cháng / gē / dàng / kū / ， / āi / tòng / bù / yǐ / 。

得知挚友去世的消息，他长歌当哭，哀恸不已。

Upon learning of his best friend's death, he sang to vent his grief and was overwhelmed with sorrow.