Josh Groban and Kelly Clarkson have some of the strongest voices in the music industry, so you can imagine how insane a duet must sound. The two of them have joined forces for a song from Groban's upcoming Stages album, which will consist of covers from famous musicals. Here, they're singing "All I Ask of You" from The Phantom of the Opera, and it's gorgeous. I dare you to listen and tell me these two shouldn't be on Broadway together, because it's that great. Listen below, and maybe we'll get to hear more from the album before it drops on April 28!