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.
Come from the Shadows Come from the Shadows was a 1972 album by Joan Baez. After recording for the independent label Vanguard for more than a decade, Baez signed with A&M, and attempted to point her career in a slightly more "commercial" direction (though the album still had overtly political overtones). In addition to her own compositions such as "Prison Trilogy","Love Song to a Stranger", "Myths", and "To Bobby" (addressed to Bob Dylan), Baez included John Lennon's "Imagine", Anna Marly's "Song of the Partisan", and Mimi Fariña's "In the Quiet Morning (for Janis Joplin)".