What song does Ozzy refer to in his song "Dreamer"  that was written by John Lennon, that encourages a world at peace?
Imagine (John Lennon song) "Imagine" is a song written and performed by English musician John Lennon. The best-selling single of his solo career, its lyrics encourage the listener to imagine a world at peace without the barriers of borders or the divisions of religion and nationality, and to consider the possibility that the whole of humanity would live unattached to material possessions.
End of the Beginning (song) "End of the Beginning" is a song by English rock band Black Sabbath featured on the album "13". According to lyricist Geezer Butler, the song deals with the fear of how "technology is going to completely take over the human race", inspired particularly by cloning: "It seems like eventually, people are going to clone the Beatles and stuff like that. I mean, it’s already happening now with a "Tupac" at Coachella, using holograms. But eventually I think they’ll start cloning people like the Beatles, and sending them out on endless tours."