Step into a time machine and get to know the biggest hit makers in the history of recorded music. © 2014 numberoneinhistory.com

This week's Pop 40:    

The Pop 40 is a weekly chart of U.S. hits that combines measures of radio airplay in all formats, online sales, and online streaming services. Its formula is weighted to skew in the direction of current, mainstream pop music without eliminating other genres from competition.

View this week's Pop 40 with chart statistics.
Look up Billboard magazine's #1 song on any day in history.

Listen to our flashback playlists below, hosted by Spotify, to hear the biggest and most memorable hits of this very week in the year listed. Take a trip down memory lane, or learn about a time in popular music before you came along.

(You must be logged in to Spotify to listen, but you can sign up for free.)

One year ago (2013): Five years ago (2009):
Ten years ago (2004): Fifteen years ago (1999):
Twenty years ago (1994): Twenty-five years ago (1989):
Thirty years ago (1984): Thirty-five years ago (1979):
Forty years ago (1974): Forty-five years ago (1969):
Fifty years ago (1964): Fifty-five years ago (1959):
Sixty years ago (1954): Sixty-five years ago (1949):
Seventy years ago (1944): One hundred years ago (1914)*:
  * Due to the scarcity of recordings this old,
the flashback from 100 years ago will be
updated annually.