Agreed on both accounts! Never thought about Tom Petty but I could see that working. I think Nightmare Before Christmas could happen eventually. Tons of interesting visuals and songs there, and Stern has done Disney before.

For music themes that will never see the light of day I'd also nominate Allman Brothers or Rolling Stones (I refuse to acknowledge TRS.) I'm partial to the blues/rock style

In the book/comic genre I'd go Jeff Smith's Bone or Wolfe's The Book of the New Sun