With all due respect, to me, this is the biggest lost the musical world has suffered in years.
Robert Sherman, along with his brother Richard, is responsible for pretty much every classic Disney song you've sung before The Little Mermaid came out. The music from Mary Poppins, The Jungle Book, The Aristocats, The Parent Trap, Bedknobs and Broomsticks and the original Many Adventures of Winnie-The-Pooh all came from the Sherman brothers. Away from Disney, they gave us the music to the likes of Chitty Chitty Bang Bang, Charlotte's Web and the Peanuts movie Snoopy Come Home. They also composed a lot of the early music for Disneyland and Walt Disney World attractions.
Basically, thank this guy for the soundtrack to your childhood. It is due to them that we know it's a small world after all, that a spoonful of sugar makes the medicine go down and that the wonderful thing about Tiggers is Tiggers are wonderful things. Without them, Portabello Road would be just another street in London, the Bear Necessities would be far more bare, and the Ugly Bugs would have no ball to attend. And to say the least, there would be no great, big, beautiful tomorrow awaiting us.
The last place you heard his work was probably in Iron Man 2. For the Howard Stark sequences, the creators of the film were trying to evoke a Walt Disney-esque flavor to the presentation (this even before Disney bought Marvel comics), so who did they turn to for the music? The Sherman Boys, of course.