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One of my favorite songs
That was a Christmas number one in UK a few years back, even then it was used in protest as people were fed up with X-factor number ones at Christmas!
Howler and Rooster posted the two that came to mind for the Viet Nam era.
Another would be Blowin in the Wind.
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Masters Of War -Bob Dylan
Only A Pawn In Their Game - Bob Dylan
Hurricane - Bob Dylan
A Hard Rains A Gonna Fall - Bob Dylan
Times They Are A Changing - Bob Dylan
Get Up Stand Up - Bob Marley
Bob Marley - War
So many to pick from...
Peter Gabriel - Biko
Bob Dylan - With God on Our Side
Peter Tosh - Equal Rights
Billy Bragg - The Price of Oil
Special AKA - Nelson Mandela
Randy Newman Political Science