Revolution -- Beatles

You say you want a revolution   Well, you know
We all want to change the world  You tell me that it's evolution
Well, you know  We all want to change the world
But when you talk about destruction  Don't you know that you can 
count me out  Don't you know it's gonna be all right  all right

You say you got a real solution  Well, you know
We'd all love to see the plan  You ask me for a contribution
Well, you know  We're doing what we can  But when you want money 
For people with minds that hate  All I can tell is brother you have to wait
Don't you know it's gonna be all right  All right, all right

You say you'll change the constitution  Well, you know
We all want to change your head  You tell me it's the institution
Well, you know  You better free you mind instead
But if you go carrying pictures of chairman Mao
You ain't going to make it with anyone anyhow
Don't you know it's gonna be all right  All right, all right

In early 1968, media coverage in the aftermath of the Tet Offensive spurred increased protests in opposition to the Vietnam War, especially among university students. The protests were most prevalent in the US, but on 17 March several thousand demonstrators marched to the American embassy in London's Grosvenor Square and violently clashed with police. Major protests concerning other political issues made international news, such as the March 1968 protests in Poland against their communist government, and the campus uprisings of May 1968 in France.

The Beatles had avoided expressing political viewpoints, with "Taxman" being their only prior song with an overt political topic. During his time inRishikesh, Lennon decided to write a song about the recent wave of social upheaval. He recalled, "I thought it was about time we spoke about it [revolution], the same as I thought it was about time we stopped not answering about the Vietnamese war. I had been thinking about it up in the hills in India."      (wikipedia)