Mika and Lang Lang can't believe 10-Year-Old Sum's performance of Haydn's 'Sonata in D major, No. 37' at Edinburgh Waverly Train Station. In episode 3, 10-year-old Sum tells Claudia Winkleman that he began learning to play piano at the age of 3 or 4. Sum goes on to wows the mentors and the crowd with his amazing skill. He is very excited to meet with Lang Lang following his crowd-pleasing performance!
