Columbia subject headings:
Clay, Charles, -1740.
Musical clock--Italy--Naples.
Musical clock.
Palazzo reale (Naples, Italy)
Harvard subject headings:
Clay, Charles, -1740.
Mechanical musical instruments--History--18th century.
Music--Italy--Naples--History and criticism.
Musical clock music.
Musical clock--History--18th century.
Musical clock--Italy--Naples.
Musical clock.
Palazzo reale (Naples, Italy)
Princeton subject headings:
Clay, Charles, -1740.
Mechanical musical instruments--History--18th century.
Music--Italy--Naples--History and criticism.
Musical clock--History--18th century.