Columbia subject headings:
Gnecchi, Vittorio, 1876-1954. Cassandra.
Strauss, Richard, 1864-1949. Elektra.
Harvard subject headings:
Gnecchi, Vittorio, 1876-1954. Cassandra (Opera)
Gnecchi, Vittorio, 1876-1954. Cassandra.
Strauss, Richard, 1864-1949. Elektra.
Princeton subject headings:
Composers--Italy--Biography.
Gnecchi, Vittorio, 1876-1954.