It might also be of interest to those reading this posting, two anecdotes related to van Beinum and Bruckner/Mahler:
First, before van Beinum took up the viola at age 16, his mother had taken him to a concert of the Concertgebouw Orchestra. The young van Beinum, years before his 16th birthday, exclaimed after the concert: "Someday I'm going to stand before this orchestra." (and indeed he did.)
Second, (and many of you are well-aware of this) Gustav Mahler's publisher once told Mahler that they could send him immediate payment for publishing some of his music, or if he was willing to wait for several months, they would have the resources to finance the printing of some of Bruckner's works. Though Mahler was far from "well-off" at the time, he deferred payment, preparing to see to it that Bruckner's work received some attention.
--John H