Allegro Non Troppo c. 1976 : F**k you Fantasia!

The 1976 animated musical Allegro Non Troppo cannot be described as anything less than an emphatic, full-throated ‘F-U’ to Disney’s Fantasia. The magnum opus of Italian animator Bruno Bozzetto, the film’s title roughly translates to “Not So Fast,” a plea to criticize not only the optimism of Disney’s aforementioned musical but of the Western notion of progress itself. Set to the classical rhythms of Debussy, Dvorák, Sibelius, Vivaldi, and Stravinsky, Bozzetto’s film flips the self-importance Disney’s orchestral concept into a raucous comedy of irreverence and unbridled self-expression.

The film’s most famous sequence, set to Maurice Ravel’s “Boléro,” depicts a sentient dollop of black protoplasmic ooze writhing from the mouth of a discarded soda bottle before slinking across a barren expanse. Big things have small beginnings, and from the folds of this tiny roiling pustule spawns an entire planetary ecosystem of mammoth monstrosities with squinting eyes and gnashing teeth. A parodic counterpoint to Fantasia’s “Rite of Spring” sequence, Allegro Non Troppo’s “Boléro” imagines prehistory not as a titanic clash of competing forces but as a Boschian acid trip of horrors during which life itself strains to survive. Allegro Non Troppo meets and arguably even surpasses Disney’s Fantasia in terms of their respective ambitions, and the film’s “Boléro” sequence is evidence of that fact.

https://www.vulture.com/article/most-influential-best-scenes-animation-history.html