Lambert -- the Season 8 runner-up for "American Idol" who went on to a successful career as a solo artist -- has been standing in for Freddie Mercury, the rock band's lead singer, who died in 1991 at the age of 45.
Formed in 1970, Queen is best known for its classic songs "Under Pressure," "We Are the Champions," "Somebody to Love" and "Bohemian Rhapsody."
Founding members Brian May and Roger Taylor are still touring with the group.
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