Radio Facts: You guessed it! Thriller,” which hit No. 4 on the Hot 100 in 1984, is the most-downloaded Halloween-themed hit of all-time, with digital sales to-date of 3.2 million, according to Nielsen SoundScan. It’s also the King of Pop’s best-selling download, ahead of runner-up “Billie Jean,” which has sold 2.5 million. Just to let you know, Ray Parker Jr’s “Ghostbusters” is the number 3 Halloween themed song of all time.