I will check out my son's book shelf, but off the top of my head, I would reccommend all of Pete Seegers books first. He and his illustrator do a wonderful job of showing many many different cultures in the illustrations (even if the story line is not focused on multicultural family issues)
Abiyoyo
Abiyoyo Returns
The Deaf Muscians
Some Friends to Feed, the story of stone soup
. . .
Abiyoyo
Abiyoyo Returns
The Deaf Muscians
Some Friends to Feed, the story of stone soup
. . .