Robert Plant surprised patrons at New Orleans club BJ's when he appeared to perform a two hour show with that night's headliner Guitar Lightnin' Lee.

Clips of the show have been uploaded to YouTube, with one user describing the set as a "blue's jam that included 12-bar and shuffle versions of 'Black Dog,' 'Since I've been Loving You,' and more."

Check out fan shot videos from the show below!