3. Buffalo Springfield, 'For What It's Worth'
Contrary to widespread belief, Stephen Stills didn't write "For What It's Worth" about Vietnam. He wrote the song in late 1966 out of solidarity with Sunset Strip hippies who fought the police over a potential new curfew. The song became Buffalo Springfield's breakthrough hit, launching the careers of both Stills and Neil Young. Countless replays in movies and Time Life commercials may have slightly dulled its impact, but it remains a classic.