Rihanna takes No. 3 for Billboard’s 25 Greatest Pop Stars of the 21st Century, and we’re breaking down why the pop diva has earned her rank with her Hot 100 No.1s, Billboard Music Awards and more! Which Rihanna song is your favorite?

Our new GPS21C episode covers an artist who only became more brilliant over each of the 13 years she spent in the spotlight.

Azealia Banks, however, is outside the doubting camp. Instead, frustrated with a popular list of the greatest 21st-century pop stars, she created her own. The curveball is that her move sparked a fresh wave of drama;