also: レクエム
noun
A musical composition or mass for the dead; also used metaphorically for something that mourns or commemorates loss.
from Latin
モーツァルトのレクイエムは未完成のまま残された。
Mozart's Requiem was left unfinished.
この曲は亡くなった友へのレクイエム
This piece was composed as a requiem for a departed friend.