New Queen documentary shows how Adam Lambert became band's new frontman

"The Show Must Go On: The Queen + Adam Lambert Story" airs Monday, April 29, on ABC.
2:34 | 04/26/19

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Transcript for New Queen documentary shows how Adam Lambert became band's new frontman
We're now going to take a look behind the scenes of one of the biggest bands of the century. Queen, and how they found their new lead singer Adam lambert and sang with them for the "American idol" finale and the rest is history. You got to take a closer look rat a documentary. The rest is history. It's been more than four decades since we first heard queen on the radio. Their songs still hitting the charts and along with Adam lambert they're still rocking the stage. We are the champions my friend Reporter: They're one of the greatest rock bands of all time once led by the inseparable Freddie Mercury. In a new documentary airing Monday night, queen's surviving band members open up about how the show almost didn't go on after Mercury's death in 1991. Freddie Mercury died last night of AIDS. Tributes to his talent and courage from friends and from fans. Only admitted publicly he had AIDS the day before he died. The idea that queen could have continued without Freddie Mercury, no way. And yet here we are. It wasn't until this young man appeared, Adam. We didn't ask for him. We didn't look for him. He just turned up and he could do everything. Reporter: With the help of singer Adam lambert queen is alive and bigger than ever. An unexpected revival that began on the 2009 "American idol" finale stage. The "American idol" people asked us to come in and play on the final competition night so it was between Adam and this other guy. Just meeting for the first time it was so surreal. I don't think I realized the weight of that moment until after the fact. Because we are the champion of the world They both are really good singers but there's some kind of chemistry already between us and Adam. It was just instant. When Adam was on stage he was not announced as the winner. I was sitting in the front row and he looked me in the eye and he said, I really wanted to win and I mouthed to him, you did. The "20/20" special "The show must go on: The queen and Adam lambert story Monday at 9:00 and Roger Taylor will join us live and a special tribute to queen on "American idol" featuring Adam lambert as a celebrity a lot to look forward to. I love Adam lambert in that role. Coming up, Rob Thomas

This transcript has been automatically generated and may not be 100% accurate.

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