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.
Every Man Has a Woman Every Man Has a Woman is a tribute album to Yoko Ono for her 50th birthday. It contains covers of her songs from the albums "Approximately Infinite Universe" (1973), "Double Fantasy" (1980), "Season of Glass" (1981), and "It's Alright (I See Rainbows)" (1982). The album was purportedly one of John Lennon's projects, but he died before he could see its completion. The liner notes for the vinyl LP feature an essay by Ono entitled "A Crystal Ball".