Campbell Live included an interview with an American singer who sold how many albums since 2009?
Campbell Live:  "Campbell Live" has interviewed various notable personalities, including Al Gore, Robert Fisk, Tony Blair, as well as an array of celebrities, including Adam Lambert and Metallica. Adam Lambert: Adam Mitchel Lambert (born January 29, 1982) is an American singer, songwriter and stage actor. Adam Lambert:  Since 2009, he has sold over 3 million albums and 5 million singles worldwide.
over 3 million