Almost every movie has one.
Bedknobs and Broomsticks = The Time of Not Believing
Mary Poppins - Stay Awake
Pinocchio - When You Wish Upon a Star
Peter Pan - The Second Star to the Right
Tarzan - You'll Be In My Heart
Chitty Chitty Bang Bang - Hushabye Mountain
Aladdin - A Whole New World
Lion King - Circle of Life
Lion King II - We Are One
Cinderella - So This is Love, A Dream is a Wish
Snow White - Someday My Prince Will Come
The Rescuers - Someone's Waiting For You
Pete's Dragon - Candle on the Water
Sleeping Beauty - Sleeping Beauty Waltz (I Know You)
The Little Mermaid - Part of Your World
Fox and the Hound - Best of Friends
Bambi - Love is a Song that Never Ends, Drip Drip Drop Little April Showers, I Bring You A Song
Robin Hood - That One Love song
Oliver and Company - You and Me
Don't forget the non-Disney though:
Charlotte's Web - Mother Earth and Father Time, We Add Up to More Me and You, Charlotte's Web
Spirit - Here I Am
An American Tail - Somewhere Out There
Rats of NIMH - Flying Dreams
Land Before Time - Dreams are for Dreaming
Thumbelina - Impossible Dreams
Most of Don Bluth's films had great music and he used to work for Disney before Walt died. He left after about Fox and the Hound (which he worked on.)