If it's Disney it's probably destined to be butchered by my vocal slayage

Roar
Dark Horse
Unconditionally
Wrecking Ball
The Climb
Burn
Call Me Maybe
Party In the u.S.A.
Heart Attack
Come & Get It
Skyscraper
Give Your Heart a Break

I think it's Stay by Rihanna or Neon Lights by Demi Lovato

Well, I always slay It's All Coming Back To Me

EDIT: Uncle too. To appreciated Katy, I always channeled her live vocal realness so I can get the vibe for that song