Question: What song does Ozzy refer to in his song "Dreamer"  that was written by John Lennon, that encourages a world at peace?
Sentence (from "Imagine (John Lennon song)"): 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.
Relevant evidence: Yes