Today I was reading Richard Dawkin’s book lyrics as soon as I found the mention of this song.
Now imagine a world without the current restrictive copyright regimes. People could build much richer experiences by connecting books, movies and music together. Imagine every book with an online version which not only contains the contents of the book but links it to news articles, music and movies. An online version which is live and vibrant, a wiki tended to by the many readers of the book.
By the way the book refers to the song for the verse
Imagine there's no countries
It isn't hard to do
Nothing to kill or die for
And no religion too
Imagine all the people
Living life in peace