Cluster — 16 works.
Defining concepts
Sleep (14), Death (13), Mortality (12), Grief and Loss (8), Lyric (6), Grave (6), Sleeper Awakes (5), Memento Mori (5), Elegy (5), Dawn (4), Immortality (4), Faith (3), Night (3), Flowers (3), Self-Knowledge (2)
Cluster — 16 works.
Sleep (14), Death (13), Mortality (12), Grief and Loss (8), Lyric (6), Grave (6), Sleeper Awakes (5), Memento Mori (5), Elegy (5), Dawn (4), Immortality (4), Faith (3), Night (3), Flowers (3), Self-Knowledge (2)