Last night, Jason performed "The Only Way I Know" on The Voice.  He gave some advice to the remaining contestants and talked a little about Blake's hair...

Aldean’s overall advice to the contestants? “Just be yourself as an artist.”

He also said of Shelton, “Unfortunately, I’ve known Blake for quite a while,” he joked. “We met on tour. We were both opening acts for Rascal Flatts in 2006. You guys may not remember this, but Blake used to have one of the gnarliest mullets.”