René Verwer The organ in the concert hall (2). Emergence and use of the organ as an orchestral instrument
Het ORGEL 113 (2017), nr. 3, 3-11 [summary]

In part 2 the author relates, among other things, what Hector Berlioz, Franz Liszt, and François-Joseph Fétis thought of the use of organ and orchestra together. The article continues with the beginning of a discussion of compositions for organ and orchestra that were published in England, France, and Germany.

Widor directs his third Symphonie april 1934 St.-Sulpice Paris (Click at the picture for a large format)