45. 2Pac
> Certified units: 37 million
> Most popular album: Greatest Hits (1998)
Although Tupac Shakur, known professionally as 2Pac, was killed at age 25 in a drive-by shooting in 1996, the rapper, who was inducted into the Hip-Hop Hall of Fame, has a huge fan base. His double-disc “Greatest Hits” album was released two years after his death. In addition, half a dozen 2Pac studio albums have come out posthumously. He was also posthumously inducted into the Rock & Roll Hall of Fame, in 2017.

44. Backstreet Boys
> Certified units: 37 million
> Most popular album: Backstreet Boys (1997)
The Backstreet Boys, a boy band from Orlando, Florida, initially found success on international music charts. But once they released their debut album, “Backstreet Boys,” in the United States, there was no stopping them. They have sold more than 100 million albums worldwide.

43. Rod Stewart
> Certified units: 38 million
> Most popular album: Rod Stewart’s Greatest Hits, Volume I (1979)
Crooner Rod Stewart started his career as a busker, went on to sell more than 250 million records worldwide, and was knighted by Queen Elizabeth II. At age 76, he is touring this fall. Stewart has had four No. 1 albums in the U.S., ranging from “Every Picture Tells a Story” (1971) to “Still the Same…Great Rock Classics of Our Time” (2006). Though his “Greatest Hits Vol. 1” only reached No. 22 on the U.S. charts, it went triple Platinum. Stewart is a double honoree in the Rock & Roll Hall of Fame — on his own (1994) and as a member of the Faces (2012).

42. Tim McGraw
> Certified units: 38 million
> Most popular album: Not A Moment Too Soon (1994)
In 1994, country singer Tim McGraw hit the bullseye with his second studio album, “Not a Moment Too Soon.” It went to No. 1 on the Billboard 200 chart, and the Academy of Country Music named it Album of the Year. Five of the songs on the album hit the top 10 on Billboard’s country charts.

41. Foreigner
> Certified units: 38 million
> Most popular album: Double Vision (1985)
Formed in New York City in 1976, the British-American rock band Foreigner came up with its name because three of the original five members were British. The group named their first album “Foreigner,” but they could have just as easily named it “Hit the Ground Running.” Their first four albums, including “Double Vision,” each sold at least five million copies in the United States.
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