The show must go on.

ABC’sAmerican Idolexemplified that age-old adage when a performer suddenly dropped out of Sunday’s finale show.

No explanation was given by the show regarding Gunn’s absence and the switch.

American Idol Arthur Gunn Graham DeFranco

Arthur Gunn, left, and Graham DeFranco on “American Idol.".Eric McCandless/ABC (2)

Apparently, that’s more information than even the judges had on Sunday.

“He literally came to cheer,“Luke Bryansaid of DeFranco during the Q&A.

And he’s like, ‘Hell yeah!'”

And in the end, fans were still able to enjoy a contestant duet with Crow.

“It’s a live, three-hour show.

And, quite honestly, we’ve had a very colorful season.

Curveballs galore,“Katy Perrysaid during the post-show Q&A.

“But Graham DeFranco?

I mean, killed it.

Sang so well, and I was so glad he was there.”

Watch DeFranco and Crow’s duet above.