Learning by Ear # Promo 2010 # 29.04.2010To view this video please enable JavaScript, and consider upgrading to a web browser that supports HTML5 videoSebastian Katzer04/30/2010April 30, 2010Learning by Ear # Promo 2010 # 29.04.2010https://p.dw.com/p/NAOkAdvertisement