Cher oscars 1998
Cher had a '90s career resurgence.
Lucy Nicholson/Reuters

Every year, the Billboard 100 chooses the best performing pop song from the previous year, based on units sold and chart performance.

Some of these songs never even hit number one, like "Hanging by a Moment," but it was on a Billboard chart for almost a full year, ubiquitous on the radio and in pop culture.

There are also a few one-hit wonders on the list, ranging from "Bad Day" of "American Idol" fame to "Somebody That I Used to Know," by Australian singer Gotye.

Scroll on to see what the top pop songs have been for the past 50 years.