Having sold more than 300 million records worldwide, Madonna is recognized as the best-selling female recording artist of all time by Guinness World Records. The Recording Industry Association of America (RIAA) listed her as the best-selling female rock artist of the 20th century and the second highest-certified female artist in the United States, with 64.5 million album units. Madonna is the highest-grossing solo touring artist of all time, earning U.S. $1.31 billion from her concerts since 1990. She became one of the five founding members of the UK Music Hall of Fame and was inducted into the Rock and Roll Hall of Fame in her first year of eligibility. Madonna was ranked at number one on VH1's list of 100 Greatest Women in Music and number two (behind only The Beatles) on Billboard's list of Greatest Hot 100 Artists of All Time.