KEITH URBAN joined GREGG ALLMAN at his concert in Nashville and was pretty stoked about it.  He traded licks with Gregg's son Devon on the Allman Brother's classic 'One Way Out.'

He Tweeted his excitement after the show:

Be still my beating heart. Man that guy can play! I could watch him all day. And not just for his good looks either. The amazing talent that comes from his body, blows me away. Plus, he wasn't even singing.