It was in 2015 during a special evening broadcast on CBS to pay tribute to the career of Stevie Wonder. Nineteen artists were present that evening at the Nokia Theater Los Angeles to sing the hits of one of the greatest American artists (Beyonce, Ed Sheeran, Gary Clark, Lady Gaga, Tony Bennett...). But the most notable performance was that of the tenor Andrea Bocelli (also blind) came to perform the legendary song I Just Called To Say I Love You. The classical singer rated the song as “Difficult” according to Billboard.