Fans who attended Brad Paisley's Thursday night (Aug. 22) concert in Mountain View, Calif. definitely got their money's worth. The 'I Can't Change the World' singer invited one of music's most iconic artists to join him for several songs onstage.

John Fogerty surprised the audience by joining Paisley to perform 'Hot Rod Heart,' a song they sing together on Fogerty's 2013 'Wrote a Song for Everyone' album. The former Creedence Clearwater Revival frontman later returned to the stage during Paisley's encore to sing Forgerty's 'Centerfield,' as well as Paisley's 'Alcohol,' before closing the show with CCR's classic hit, 'Proud Mary.'

Also on hand for the show was Chris Young, who had taken time off serving as an opening act on Paisley's Beat This Summer tour due to a life-threatening leg infection. The singer, in keeping with Paisley's never-ending pranks on tour, was wheeled onstage by fellow opener Lee Brice in a hospital gown.

Young, who went into septic shock after bacteria got into a cut on his leg, says that even before he returned to the concert stage, Paisley was already hinting he was going to use his unfortunate incident for a little comic relief.

"Thank god I don't have to sit down, because Brad called me after it all went down and he's like, 'Please tell me you have to sit on a stool, please tell me you have to sit on a stool, because we're going to make fun of you,'" Young tells MSN News.  "I'm like, 'Nope. Unfortunately, you don't get to make fun of me today.'"