Tens of thousands marched on Washington last Saturday to protest George Bush's war in Iraq. The crowd included college-age activists, veterans of Vietnam War protests, entire families united against the war, and parents whose children have been killed in Iraq. It was the largest protest yet against this war. Larger ones will almost surely follow. If there had been a soundtrack to Saturday's march past the White House, you couldn't pick a much more appropriate song to kick it off than Jefferson Airplane's "Volunteers." Released in 1969 by one of the most politically acute bands of the era, "Volunteers" was...