In broadcasting, rotation is the repeated airing of a limited playlist of songs on a radio station or satellite radio channel, or music videos on a TV network. They are usually in a different order each time, however they are not completely shuffled, so as to avoid playing the same song again too long or short apart. Stations playing new music typically have a short rotation of around four hours, while stations playing "classics" may go as long as eight hours. College radio and indie radio stations often have no particular rotation, only the music director's suggested lists for the disc jockeys, or are totally freeform radio. Broadcast automation systems handle a limited rotation quite well, in turn making voice tracking easy. Even if a live person is present, the automation system at commercial stations usually picks the music ahead of time out of the current rotation, thus the DJ becomes only an announcer.

Heavy rotation or power rotation is a term that applies to a list of songs that get the most airplay on a radio station. Songs in heavy rotation will be played many times in a 24-hour period. A reason for playing the same song more than once a day is many listeners tune in expecting to hear their favorite song, and most listeners don't listen to the radio for extended periods of time. However, this also leads to listener fatigue for those who work in stores and must hear the same songs repeatedly every day.

Mayu Watanabe (渡辺 麻友, Watanabe Mayu^?, born March 26, 1994 in Saitama Prefecture) is a member of the Japanese girl idol group AKB48's Team B. She is also a member of Watarirouka Hashiritai and Team Dragon from AKB48. Her nickname is Mayuyu.

In 2006, Watanabe was chosen out of 13,000 applicants to become a member of the Japanese idol group AKB48.

She has been selected as the selection member since the 4th single "BINGO!" (2007).

According to June 15th, 2011 episode of AKB's variety show, AKBingo. Watanabe's nickname "Mayuyu" and Team 4's Shimazaki Haruka's nickname "Paruru" were both originated by former teammate Rumi Yonezawa.

Watanabe placed 4th in the 13th single members selection which took place in the end of June — beginning of July, 2009.

Mayuyu ranked 5th in the 17th Single Senbatsu Election.

At the end of October, 2010, Mayu Watanabe appeared on the cover of the December issue of UP to boy magazine together with Airi Suzuki from °C-ute. That was the first gravure collaboration between Hello! Project and AKB48.