Italian singer Andrea Bocelli is a superstar. The Grammy- and Emmy-nominated tenor is one of the highest-selling vocalists in music. In 1999, Bocelli scored a Guinness World Record for simultaneously holding the No. 1, 2 and 3 spots on Billboard's Classical Top 10 chart. Since then, Bocelli has collaborated with everyone from Celine Dion to Ariana Grande. But on his latest album, Sì, Bocelli tries something he finds really daunting — recording with his 21-year-old son, Matteo.