This list is 100% objective and not up for debate.

S Tier:
Prince Ali (Reprise) [Aladdin]
- It's a shame that this one is so short, because Jafar's voice lends itself perfectly to his menacing qualities
Friends on the Other Side [The Princess and the Frog]
- A rich bass voice and the song wonderfully articulates an outline of the conflict for the rest of the movie

A Tier:
Gaston [Beauty and the Beast]
- Only thing preventing this from being S or S+ tier is that Gaston doesn't sing more of the song.
Be Prepared [The Lion King]
- The imagery combined with the wonderfully rich voice of Jeremy Irons + Jim Cummings can only be described as chilling

B Tier:
Fidelity Fiduciary Bank [Mary Poppins]
- This isn't a joke entry. This song represents what makes Mr Banks start as the antagonist, who comes around by the end of the movie.
The World’s Greatest Criminal Mind [The Great Mouse Detective]
- Thx Vince

C Tier:
Trust in Me [Jungle Book]
- Good song marred by the fact Kaa isn't really the villain, Shere Khan is. Kaa is perhaps chaotic neutral at worst.
Poor Unfortunate Souls [The Little Mermaid]
- Ursula is one of the most lukewarm villains in all of Disney. A one-dimensional character in a one-dimensional movie, and the song just clarifies the point that she's less of a threatening, imposing figure and more of a petulant loan shark.

F Tier:
Cruella de Vil [101 Dalmations]
- Has anyone ever given a shit about 101 Dalmations? That doesn't really affect my opinion of the song, which is also shit, but like... is there anyone in the world that cares about 101 Dalmations?