George's bad day gets worse when he comes over to Mrs. McGrady's house to sing for Koko Taylor and his friends insult his quiet voice. After listening to one of the Brain's CDs, George dreams that he and his ventriloquist dummy Wally are in a blues-related adventure. He builds a guitar with his dad and gets a second chance to overcome his stage fright. Will he be able to prove he isn't a a ""small-mouth"" to Koko Taylor and Taj Mahal?