sung requiem; requiem song
Refers to a requiem that is sung, as opposed to an instrumental requiem. The term is not common in everyday Japanese; 鎮魂曲 (ちんこんきょく) alone is more usual.
This requiem song is sung in memory of the deceased.
鎮魂曲 is the standard word for 'requiem' and can be instrumental or vocal. 鎮魂曲歌 explicitly specifies a sung requiem, but is rarely used.
Compound of 鎮魂 (ちんこん, 'repose of souls') + 曲 (きょく, 'musical piece') + 歌 (か, 'song'). The exact origin is uncertain; it may be a coined term to distinguish a sung requiem from an instrumental one.