Kelly Clarkson and Josh Groban Sing the Perfect Cover of 'Phantom of the Opera's' 'All I Ask of You'!

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It's one of the most beautiful collaborations.

Phantom of the Opera's music just got even more beautiful.

Powerhouse vocalists Kelly Clarkson and Josh Groban sing "All I Ask of You" from the hit musical, and they're leaving many wondering when they can see them for a Broadway stage performance.

In the duet, Clarkson, 32, and Groban, 34, take on the characters of Christine Daae and Phantom, which will be featured on Groban's upcoming album Stages.

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Stages is set to drop on April 28, but for now, take a listen to the ballad here.

Clarkson tweeted to Groban back in March saying, "So excited about this new album 4 you! What an amazing collection of songs!! Thanks for asking me."

He replied back, "I'm so honored you said yes!! What a joy to finally work with you on a song that means so much to me. You sound SUPERB!"

The gushing hasn't stopped as Groban tweeted at his duet partner with one simple but meaningful word on Tuesday, "Bravo!"

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Stages also features "Bring Him Home" from Les Miserables and "Over the Rainbow" from The Wizard of Oz.

Check out the video below to see what makes Josh Groban happy.