Letter from Gustav Mahler to Zemlinsky undated, before 1904: „I enjoyed expressing my affiliation to your endeavours and my complete sympathy for your aims. As you now regard it as useful or appropriate that I publicly avow my faith in the future by accepting a title, do give me whatever name you wish. […]” On 23 April 1904 Mahler was elected honorary president of the Association of Creative Musicians founded by Zemlinsky and Schoenberg.