Fifteen years into her Billboard chart career, Mariah Carey was still achieving firsts. In 2005, the superstar’s smash “We Belong Together” spent 14 weeks at No. 1 on the Billboard Hot 100 songs chart ...

Thanks to the 2003-2004 blockbuster successes of artists like Usher, OutKast, 50 Cent, Kanye West and Beyoncé, by 2005, it was unquestioned that hip-hop and R&B had now firmly replaced the teen pop ...

Our staff's favorite songs from a year that confirmed that hip-hop and R&B were now at top 40's center, but also had plenty of great rock, country and dance-pop to go around. This week, Billboard is ...