One song hit No. 1 for only one week, but then returned for one more week twice more. “Uptown Funk” spent 14 weeks at No. 1 and was the biggest-selling song of the year.

Although I expected “Uptown Funk” to make the list, I was quite surprised to see that the number one spot went to—drumroll, please— The Weeknd’s “Blinding Lights.” The song was ...