I agree with those who've mentioned Hercules...I really think new songs added to the fantastic ones from the movie could really work, as long as it's David Zippel writing the lyrics and not Glenn Slater; my opinion on Slater is: I appreciate his original lyrics to a lot of Sister Act and Tangled, but I absolutely loathe his contributions to Mermaid - barring She's in Love. The thing about casting for the title character would probably be a little strange, because the character post-training with Phil is a bodybuilder physique, and I don't know of many professional singers roughly the size of a barge.
Any new music for the Muses and Meg, as well as ANY music for Hades and adult Hercules could all be wonderful contributions to my favorite post-Aladdin Disney scores, which I much prefer to most of Mulan and Pocahontas. Mulan's music is mostly mediocre, Pocahontas' is mostly filler, except Just Around the Riverbend (in my opinion, quite possibly Stephen Schwartz's best lyric ever), Colors of the Wind and If I Never Knew You.
"Contentment, it seems, simply happens. It appears accompanied by no bravos and no tears."