Kalbeck was a close friend and partisan of
Johannes Brahms. Kalbeck's principal achievement was his eight-volume
biography of that composer, published from 1904 to 1914, which has never been translated into English. Kalbeck also edited several volumes of Brahms's correspondence and in 1918, the letters of the poets
Gottfried Keller and
Paul Heyse, as well as publishing two collections of his music reviews. Kalbeck wrote new
libretti for
Mozart's
Bastien und Bastienne and
La finta giardiniera; and he revised those of
Don Giovanni and
The Marriage of Figaro for
Gustav Mahler's productions at the
Vienna Hofoper. In addition, he supplied lyrics for the songs in the
operetta Jabuka by
Johann Strauss II, the dialogue and plot being the work of
Gustav Davis. Kalbeck also wrote poetry and Brahms set a few of his verses to music as songs. == Personal life ==