Taylor Swift named No. 2 greatest pop star of the 21st century by Billboard. Who will top the chart?

American mega popstar Taylor Swift has been named no 2 greatest pop star of the 21st century by Billboard. Taylor Swift in February made history by becoming the first person to win the Grammy for album of the year four times. She was also named Time magazine's person of the year for 2023. But who will be named no 1 greatest pop star?