Columbia subject headings:
Harvard subject headings:
Operas--Librettos
Oratorios--Librettos.
Songs--Texts
Theodorakis, Mikis
Vocal music--Texts.
Princeton subject headings:
Librettos.
Operas--Librettos.
Oratorios--Librettos.
Songs--Texts.
Theodorakis, Mikis.