Recurrent rotation refers to a group of songs still frequently aired on a contemporary hit radio

Contemporary hit radio

Contemporary hit radio is a radio format that is common in the United States, United Kingdom, Canada and Australia that focuses on playing current and recurrent popular music as determined by the Top 40 music charts...

 station even several months or even years after the initial debut. It is also used to describe core songs in other radio format

Radio format

A radio format or programming format not to be confused with broadcast programming describes the overall content broadcast on a radio station. Radio formats are frequently employed as a marketing tool, and constantly evolve...

s as well. Most charts have special rules to determine when a song has become recurrent, at which point they are removed from current charts (such as the Billboard Hot 100

Billboard Hot 100

The Billboard Hot 100 is the United States music industry standard singles popularity chart issued weekly by Billboard magazine. Chart rankings are based on radio play and sales; the tracking-week for sales begins on Monday and ends on Sunday, while the radio play tracking-week runs from Wednesday...

) and placed on special "recurrent charts." Recurrent charts tend to be more static, with less week-to-week changes in popularity, than current charts.

The Billboard

Billboard (magazine)

Billboard is a weekly American magazine devoted to the music industry, and is one of the oldest trade magazines in the world. It maintains several internationally recognized music charts that track the most popular songs and albums in various categories on a weekly basis...

charts include these lists:

• Hot 100 Singles Recurrents
• Hot 100 Recurrent Airplay
• Hot R&B/Hip-Hop Recurrents
• Hot R&B/Hip-Hop Recurrent Airplay
• Top 40 Adult Recurrents
• Hot Adult Contemporary Recurrents
• Hot Country Recurrents