From the recording The Ancient Greek Kithara of Classical Antiquity
This piece, in the intensely sorrowful ancient Greek Hypodorian mode, attempts to evoke the tragic scene and circumstances of the death of Agamemnon as described in ancient Greek literature. As explained in Wikipedia:
“In Greek mythology, Agamemnon…was the son of King Atreus and Queen Aerope of Mycenae, the brother of Menelaus, the husband of Clytemnestra and the father of Iphigenia, Electra or Laodike (Λαοδίκη), Orestes and Chrysothemis. Mythical legends make him the king of Mycenae or Argos, thought to be different names for the same area. When Helen, the wife of Menelaus, ran off with Paris of Troy, Agamemnon commanded the united Greek armed forces in the ensuing Trojan War.
Upon Agamemnon's return from Troy, he was murdered (according to the oldest surviving account, Odyssey 11.409–11) by Aegisthus, the lover of his wife, Clytemnestra. In old versions of the story, the scene of the murder, when it is specified, is usually the house of Aegisthus, who has not taken up residence in Agamemnon's palace, and it involves an ambush and the deaths of Agamemnon's followers as well.”
This piece is therefore in the intensely sorrowful ancient Greek Hypodorian mode; the ‘natural minor’ mode (misnamed the ‘Aeolian’ mode in the Middle Ages), whose intervals from which all of our modern minor scales are ultimately derived.