There was so much good music in the 60's, it would be impossible to narrow it down to one song. Some of my favorite songs are:
Whole Lotta Love - Led Zeppelin
Bad Moon Risin' - Credence Clearwater Revival
Come Together - The Beatles
Honky Tonk Women - The Stones
Can't Always Get What You Want - The Stones
Blowin' in the Wind - Bob Dylan
You Really Got Me - The Kinks
House of the Rising Sun - The Animals
Satisfaction - The Rolling Stones
Eleanor Rigby - The Beatles
Hey Jude - The Beatles
Paint it Black - The Rolling Stones
Under My Thumb - The Rolling Stones
Brown Eyed Girl - Van Morrison
Foxy Lady - Jimi Hendrix
All Along the Watchtower - Jimi Hendrix
Happy Together - Turtles
Light My Fire - The Doors
Jumpin Jack Flash - the Stones
Born to Be Wild -- Steppenwolf
Mrs. Robinson - Simon and Garfunkel
Magic Carpet Ride - Steppenwolf
White Room - Cream
My favorite music period was the 70's though.

I wanted to be a hippie sooo bad but I was too young.