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.
Down to Earth (Ozzy Osbourne album) Down to Earth is the eighth studio album by British heavy metal vocalist Ozzy Osbourne. Released on 16 October 2001, the album reached number 19 on the UK Albums Chart and number four on the US "Billboard" 200 albums chart. "Down to Earth" spawned just two singles, although both reached the top-ten of the US Hot Mainstream Rock Tracks chart and reached number 18 on the UK Singles Chart. The album was certified Platinum and has sold over 1.6 million copies worldwide.