The guitar legend speaks about the famous festival and the path that led him there. Next week marks the 50th anniversary of one the signal cultural events of America's last half century: the "three days of peace and music" that came to be known as Woodstock. One artist still going strong from the era is famed musician Carlos Santana. In the second half of our two-part series on the guitar legend, NewsHour Weekend's Tom Casciato speaks with Santana about history's most famous music festival, and the road that took him there.