Max 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 own 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
Ramón Iriarte doors opened to him in the opera world. As Claudio in Montero's "Virginia," and roles in "L'amico Fritz", "Carmen", "Aida", "Pagliacci", "Madama Butterfly", and "Bastien und Bastienne" had become part of Iriarte's wide music repertoire full of success. One of the main places where Iriarte got to show his talent in a national way was in the Teatro Municipal de Caracas. In 1967 was the first time he performed internationally in New York City where he gained fame and reputation. His baritone's life kept blooming as the years passed. For over twenty–five years he dedicated his life to opera and