This is a summary of the song "Imagine" by John Lennon in 3 sentences or less:
The song imagines a world without divisions like heaven, hell, countries, or religion and instead envisions a utopian world where people live in peace and harmony, sharing all the world without possessions, greed, hunger or need to kill or die for anything. The singer hopes that others will join in this vision and that the world will unite as one.