Lee DeWyze Performs 'Treat Her LIke A Lady' on 'American Idol'

Looking for his moment, Lee Dewyze went obscure with the Cornelius Brothers' 1971 song "Treat Her Like a Lady," rubbing his outlaw-rocker grit onto the tune.

Usher was blown away by Lee's voice and told him to just believe in himself. The advice seemed to sink in, as Dewyze rocked the house with a strummy throw-down that highlighted his barroom gusto and finally displayed some hard-won confidence and star power.

"Unbelievable," Randy gushed, a sentiment Kara backed up, saying Dewyze completely made the song his own. "This was the night your life may have changed forever," Simon added.

DeWyze was the clear alpha singer of the night. The leather-clad pick-chewing Illinois native started out looking genuinely surprised when guest mentor Usher called his voice “incredible.” But the musician's kudos gave the gravelly voiced vocalist the confidence to push the Cornelius Brothers' "Treat Her Like a Lady" to the hilt.

At the end of DeWyze's performance, Cowell put it succinctly, "This night may have changed your life."