Bob Dylan的音樂根源

http://www.dailymotion.com/video/xqq4i0_bob-dylan%E7%9A%84%E9%9F%B3%E6%A8%82%E6%A0%B9%E6%BA%90-%E6%BF%83%E7%B8%AE-%E7%B9%81%E4%B8%AD%E5%AD%97%E5%B9%95_animals