A 'dirge' is a song to be sung at -

• Dirge (noun):
English Meaning: A song sung in the past at a funeral or for a dead person. // any song or piece of music that is too slow and sad.
Bangla Meaning: অন্ত্যেষ্টিক্রিয়ার সময় গাওয়া শোকসংগীত; মৃতের জন্য শোকগীতি।

Synonyms: Hymn, Elegy (শোকগীতি, শোকগাঁথা), Funeral song (শেষকৃত্যের সময় গাওয়া গান), Lament (বিলাপ)।
Antonyms: Happy song (আনন্দের গান), Rejoicing, Celebration (আনন্দ উৎযাপন)।

Others form: dirgelike (adjective).
Example Sentence:
1. Catherine hummed and sang a hymn that faded quickly from a cheery ode to a mournful dirge.
2. The Band played a haunting dirge at the funeral for the fallen leader.

Source: Website Lecture.