from Cinegraphic.net:

Frank Lloyd Wright at Disney

story © internetted, December 17, 2006 all rights reserved.

URL: https://www.cinegraphic.net/article.php?story=20061217110442298

Disney History blog has posted several pages of transcript of FLW talking to Disney animators about their use of music. From what they're talking about it sounds like this discussion may relate to the origins/development of Fantasia since the use of music FLW talks about it closer to Fischinger's work than to Disney's other films.

via Cartoon Brew