The word “exequies” means “accompaniments.” In a general sense it is used especially in the Roman Catholic Church, the Orthodox Church, and the Anglican Communion (but not Protestant churches) for funeral rites up to and including the burial.
In a narrower sense “exequies” is a musical term for the music accompanying such rites. Here we might mention particularly the many requiems and the Musikalische Exequien of Heinrich Schütz (1636). Exequies in this sense mostly include pieces from the Mass for the dead, and only rarely those of the Burial Office alone.