how many times must a man look up

 Before he can see the sky

 Yes, 'n' how many ears must one man have

 Before he can hear people cry?

 Yes, 'n' how many deaths will it take till he know

 That too many people have died?

 The answer, my friend, is blowin' in the wind,

 The answer is blowin' in the wind

[Blowin' in the Wind-Bab Dylan]