"Blowin' in the Wind" -  Bob Dylan's 1962 classic.

He asked a series of unanswerable questions about how long it will take for humanity to establish lasting peace, compassion, and justice.

"The answer, my friend, is blowin' in the wind." Finding an end to human cruelty, the song suggests, is a matter of understanding a truth that's all around-but paradoxically impossible to grasp.