This Week's Billboard Top 12, Part 3 by GersonA

Question 1

With their smash hit Closer, which topped the Billboard Hot 100 for 10 weeks and counting, The Chainsmokers broke a record for most number-one singles on the Billboard Hot Dance/Electronic Songs chart, with 4. What Scottish DJ and singer, the world's highest-paid DJ, held the previous record, with 3?

Calvin Harris