Columbia subject headings:
Beethoven, Ludwig van, 1770-1827. Variations, op. 34,
Musical temperament.
Tuning.
Harvard subject headings:
Beethoven, Ludwig van, 1770-1827. Variations, op. 34,
Musical temperament--History--19th century.
Piano music.
Piano--History--19th century.
Variations (Piano)
Princeton subject headings: