I know I am gonna get a lot of flack for this but here it goes.
I've been watching Lilo and Stitch every night for the last few weeks, and I thought that with them looking into Elvis Presley's catalog, they could look into the catalogs of other big and popular bands.
A few suggestions:
The Beatles- Universal and very appealing to Disney
The Who- A long shot but it seems they could try
The Beach Boys- Come on? Fun fun fun?
Foo Fighters- A BIG long shot but many of thier songs have kind of an archetype Disney feel- "Learn to Fly," "Everlong"