Music 2000-to now Pop #1s

Which artist is tied for the most number ones with Elvis?

Which year was Happy the number one song of?

Which #1 song was the song of the summer in 2015?

Which artist has four #1s?

How many numbers ones is the most one persons ever had?

What is the #1 song of 2004?

Which artist recently got his first #1?

Who is one of the only artists to have 5 #1s off of one album?

Which year did Taylor Swift get her first #1?

Who's hit song debuted at #1 last year?

Who had the first #1 of 2016?

Which artist who debuted in 2005 currently has 14 #1s?

Which artist's first solo number one topped the charts last year?