Is Madonna a greater artist than Taylor Swift? As one musical titan continues her tour, another sets on the road. But pop fans are fiercely divided over which one is the true queen of pop.
It’s Madge v TayTay for greatest of all time
Face off: Both Madonna and Taylor Swift have become multimillionaires due to their musical success. Glossary
Swifties - Fans of singer Taylor Swift.
O2 - An entertainment area built within the dome of a building that used to be called the Millennium Dome in Greenwich, south east London.
Grammys - The most prestigious award in the US music industry. The trophy is shaped like a gilded gramophone. Last year, Billie Eilish won most of the main awards.
VMAs - The MTV Video Music Awards
Country music - A music genre that began in southern and southwestern USA. It often includes themes of working class American life.
Reggaeton - A style of popular electronic music that first emerged in Panama in the 1980s. It is popular across the Spanish-speaking Caribbean.