Teen sensation Alondra Santos performs La Copa de la Vida in the AGT semifinals.\rbr\rbr\rbr\rbr3 Shades of Blue, Daniella Mass, Alondra Santos and Piff the Magic Dragon Here are their performances: 3 Shades of Blue .\rbr\rbrGolden Buzzer performer Sharon Irving thrills the crowd with her take on Imagine.\rbr\rbrOne-of-a-kind magician Piff the Magic Dragon takes his shot at the AGT finals.