People have said 1973's The Sting use of Scott Joplin's ragtime music from the turn of the century was anachronistic because the movie is set in 1936. I think it's brilliant because that was the music of the time when Paul Newman's character Henry Gondorf, Luther, Kid Twist and all the other old cons were young and in their prime. Using actually era appropriate music like Benny Goodman swing wouldn't work. It's like if you have a movie set in the 80s but about main characters in their 50s, you wouldn't use Prince or Duran Duran on the soundtrack. You'd have like Sinatra or Dean Martin or Rosemary Clooney or Peggy Lee.