"your Terpsichore, your Echo, your Clytemnestra"
is the Greek muse of dance and theatrical choruses. Echo
was a nymph who, in Greek mythology, fell in love with a self-absorbed youth who scorned her, and pined away for love of him. Clytemnestra
is another figure from Greek mythology, who plotted with her lover to murder her husband, only to be murdered in turn by her son Orestes.
Classical references such as these, particularly comparisons between a beloved and mythological women, were common in the poetry of Nehemiah's period.