VIDEO: John Mellencamp surprises visitors at Rock and Roll Hall of Fame

John Mellencamp surprises Rock Hall visitors
Posted at 6:59 PM, Sep 02, 2017
and last updated 2017-09-03 10:13:45-04

You just never know what's going to happen at the Rock and Roll Hall of Fame. 

On Saturday, that meant a surprise visit from John Mellencamp. 

Visitors told News 5 the Grammy award winning artist put on an impromptu concert, just walking on stage and singing 7 or 8 songs. 

The Rock Hall didn't actually introduce him, but fans knew who it was right away. 

Mellencamp was inducted into the Rock and Roll Hall of Fame in 2008.