In his 1967 megahit "San Francisco," Scott McKenzie sang of "people in motion" coming from all across the country to San Francisco, the white-hot center of rock music and anti-war protests. At the same time, another large group of young Americans was also in motion, less eagerly, heading for the jungles of Vietnam.

Now, in The Republic of Rock, Michael Kramer draws on new archival sources and interviews to explore sixties music and politics through the lens of these two generation-changing places--San Francisco and Vietnam. From the Acid Tests of Ken Kesey and the Merry...