Columbia subject headings:
Piano makers--History--18th century.
Piano makers--History--19th century.
Piano--Construction.
Piano--History--18th century.
Piano--History--19th century.
Harvard subject headings:
Beethoven, Ludwig van, 1770-1827--Criticism and interpretation.
Haydn, Joseph, 1732-1809--Criticism and interpretation.
Mozart, Wolfgang Amadeus, 1756-1791--Criticism and interpretation.
Piano makers--Germany--Biography.
Piano--Construction--Germany--History.
Piano--Germany--History--18th century.
Piano--Germany--History--19th century.
Princeton subject headings:
Beethoven, Ludwig van, 1770-1827--Criticism and interpretation.
Haydn, Joseph, 1732-1809--Criticism and interpretation.
Mozart, Wolfgang Amadeus, 1756-1791--Criticism and interpretation.
Piano makers--Germany--Biography.
Piano--Construction--Germany--History.
Piano--Germany--History--18th century.
Piano--Germany--History--19th century.