A social commentary: each people group living in harmony with each other. This is starting to fray in some quarters as one group within a host nation makes demands of it that leads to segragation. Population shifts within Europe also cause tensions as the door into the host nation is just too open. Nations in conflict in parts of the world. People within nations destroying each other. The list could go on.
Whit Duck, Black Ducks had me thinking along these lines. Dont' know if harmony was your intention, clearly sounds like it, but how ideal it would be. Paul McCartney and Stevie Wonder dueted on a same two colour theme: 'Ebony and Ivory'.

Cute!