One of the most successful music artists, Underwood has sold 70 million records worldwide. She is the seventh highest-certified female artist of all time on the RIAA's Top Artists (Digital Singles) ranking, the highest-certified country album artist to debut in the 21st century and the woman with most number-one singles on the Billboard Country Airplay chart, with 15. Her accolades include seven Grammy Awards, 11 Billboard Music Awards, 13 American Music Awards, a Guinness world record, 14 ACM Awards and nine CMA Awards. Acclaimed by Rolling Stone as "the female vocalist of her generation of any genre", she was listed by Time as one of the 100 most influential people in the world in 2014. Forbes has declared her the most successful American Idol winner. Billboard named Some Hearts the number-one country album of the 2000s and her as the top female artist on its "Best Country Artists of the 2000s" list. She has been inducted into the Hollywood Walk of Fame, Grand Ole Opry, Oklahoma Hall of Fame and Oklahoma Music Hall of Fame.