Highest-ranked female musician in Forbes' "Celebrity 100" list

In the 12-month period to 1 June 2014, singer and entrepreneur Beyoncé Knowles (USA) earned at estimated $115 million (£68.6 million), enough to secure the No.1 position on Forbes' list of the most "powerful" celebrities. Forbes reported that "Queen B" played 95 concerts on her 'The Mrs Carter Show World Tour' in the tracking period, with each show raking in an average of $2.4 million (£1.7 million), and she also released her self-titled "visual album" in December 2013, which became the fastest-selling album in iTunes history. Other factors include company endorsements, a line of fragrances and her own clothing business, House of Dereon. Beyoncé's husband, rapper Jay Z, was ranked the sixth most "powerful" celebrity for the same period, with estimated earnings of $60 million (£35.7 million). The Top 10 most "powerful" celebrities (1 June 2013 to 1 June 2014), according to Forbes, were:

1. Beyoncé Knowles (USA, singer) - $115 million (£68.6 million)

2. LeBron James (USA, basketball player) - $72 million (£42.9 million)

3. Dr Dre (USA, rapper) - $620 million (£369.8 million)

4. Oprah Winfrey (USA, talk-show host) - $82 million (£48.9 million)

5. Ellen DeGeneres (USA, talk-show host) - $70 million (£41.7 million)

6. Jay Z (USA, rapper) - $60 million (£35.7 million)

7. Floyd Mayweather (USA, boxer) - $105 million (£62.6 million)

8. Rihanna (Barbados, singer) - $48 million (£28.6 million)

9. Katy Perry (USA, singer) - $40 million (£23.8 million)

10. Robert Downey, Jr (USA, actor) - $75 million (£44.7 million)

Source: Forbes. Conversions in £ calculated on Oanda to 1 June 2014

The female musicians on Forbes' Celebrity 100 list were:

1. Beyoncé Knowles (USA) - $115 million (£68.6 million)

8. Rihanna (Barbados) - $48 million (£28.6 million)

9. Katy Perry (USA) - $40 million (£23.8 million)

17. Miley Cyrus (USA) - $36 million (£21.4 million)

18. Taylor Swift (USA) - $64 million (£38.1 million)

19. Lady Gaga (USA) - $33 million (£19.6 million)

33. Jennifer Lopez (USA) - $37 million (£22.0 million)

The Celebrity 100 factors in estimated earnings over a 12-month period, how many times a celebrity is mentioned in print and on TV/radio, "social networking power" across platforms such as Twitter, Facebook and YouTube, and an "impact ranking" to indicate how much of an impact a celebrity has had on the "entertainment industry and our culture overall". The data is processed through an algorithm to create a celebrity's power ranking, with earnings carrying the most weight. The celebrities are finally divided into categories (musicians, actors, sports personalities, etc.) and a certain number of celebrities from each category make the final list.

Trivia: In October 2014, Houston's News92 (USA) laid off 47 employees and was rebranded as B921, a Beyoncé-only radio station playing the singer's music 24 hours a day without DJs or commercials.