I could be pedantic and choose something like, I dunno, Duel of the Fates or even one of a couple Queen songs given that they were in Disney movies but you alluded to the animated canon in a conversation earlier so that's what I'll be working with. Gonna leave the Fantasia songs out of this; I trust this isn't exactly a controversial stance. I'm also leaving out the Eurobeat versions, but I did want to mention them because did you know there are eurobeat versions? There are some bangers on there.
4) Everybody Wants To Be A Cat, from The Aristocats, but only when the Asian caricature cat's part is yeeted into the sun. So basically the first and last thirds of it. Which I guess is a testament to how catchy the rest of the song is that I'm putting it on this list. It was basically stuck in my head for, like, a decade after only seeing the movie once or twice, so that's why it's here. When I actually went back to watch the scene... yeah a lot of it isn't okay. Fortunately, there's at least one electro swing cover that doesn't have it so I listen to those more than the orignal these days.
3) Supercalifragilisticexpialidocious, from Mary Poppins. A short one and more a novelty than anything else but there's a memetic ubiquity about it that gives it a certain charm. In my experience, as soon as I say the word people tend to get right into the rest of the chorus, which has to count for something, I think.
2) A Friend Like Me, from Aladdin. Admittedly, a lot of this is carried by the animation accompanying it (and I could probably do a whole essay on how the live-action version tries to replicate it (with success depending on the viewer, I suppose)), but it's still a banger that introduces Williams' energy to the movie and I can't imagine anything (or anyone) else doing the job.
1) Hellfire, from The Hunchback of Notre Dame. I had to keep it down to just one villain song, and this is that one. Not much needs to be said about it, I think. So good I made a version of it for Yugioh Skies. It goes a long way to develop Claude Frollo's character, but it also serves to firmly establish him as someone who cannot be reasoned with or brought to redemption except by an act of God, something neither the movie nor its source material provides.