That's the word on the street. Supposedly during country week he wanted to sing a Hank Williams Jr. song and it was scrapped.
Well, it's at least the 3rd, because he changed during Queen week, too. They showed him practicing with Queen one song then they showed him going in to another practice and said, "Change of plans. I'm going to be singing this..."
A lot of people believe the producers have manipulated performances by messing with the sound system and some other production tricks. If they are also manipulating the contestants into not going with their preferred song choices, I hope they get sued eventually.