In The Little Mermaid, Ariel trades her voice for legs. The sea witch Ursula performs an occult ritual under the sea (typical for Disney films) and forces Ariel to sing the song below, her voice growing ever more reverberated as it leaves her mouth. Click on each phrase to listen from that point on; click again to stop.
Ariel sings a Lydian lullaby changing key every 4 bars, from G Major up to Bb Major and up again to Db Major. Up™. She presumably would’ve kept changing keys forever if Ursula didn’t cut her off. The harmony follows a VI -- V chord progression. A similar progression and modulation can be found in the “Mushroom House” music from Super Mario Bros. 3.