Watch Paul McDonald's "Perfect, Imperfect" Johnny Cash Performance on 'American Idol'

Paul McDonald added some rock tenderness to his bluesy voice, delivering a strong performance of Johnny Cash's "Folsom Prison." The Nashville singer took the stage once again with his guitar and gave the Cash classic a more up-tempo feel that had Jennifer Lopez clapping in her seat.

Randy Jackson kept it simple with three little words — "I loved it!" he shouted, after Paul closed out the show.

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"Paul you are such a crazy character man," rocker Steven Tyler shared. "A perfect imperfect boy."

J. Lo felt it was a "perfect way to end the show."

"Your amazing," she praised. "Good job, good job."

We think Paul's interpretation worked. Watch the clip below and share your thoughts in the comments!