The Archduke Rudolph (1788-1831) was one of the master’s warmest friends, and one of his most devoted admirers. His uncle was Max Franz, Elector of Cologne, to whose chapel both Beethoven and his father had belonged. The Archduke was the son of Leopold of Tuscany and Maria Louisa of Spain; his aunt was Marie Antoinette, and his grandmother the famous Maria Theresa. He is supposed to have made the acquaintance of Beethoven during the winter of 1803-4, and then to have become his pupil. The pianoforte part of the Triple Concerto (Op. 58), commenced in 1804, and published in 1807, is said to have been written for him.
Concerning the Countess Giulietta Guicciardi, for whom Beethoven entertained a hopeless passion, and the Countess Theresa of Brunswick, to whom he is said to have been secretly engaged for some years, there is no necessity to enter into detail. Everyone has probably heard of the famous love-letters, and of the discussion as to which of these two they were addressed. Maximiliane Brentano was a niece of the famous Bettine Brentano.
The Baroness Ertmann was an excellent performer on the pianoforte, and is said to have been unrivalled as an interpreter of Beethoven’s music. Mendelssohn met her at Rome in 1831, and in a letter describes her playing of the C sharp minor and D minor Sonatas.
We must now turn to the sonatas, yet neither for the purpose of analysis nor of admiration. We shall briefly discuss how far Beethoven worked on the lines established by his predecessors, and how far he modified them. And, naturally, the question of music on a poetic basis will be touched upon.