Wally has always loved MercyMe's Cover Tune Grab Bag, where the band covers popular songs on video. Hear the story behind Bart's favorite songs, and then Wally lives out a lifelong dream by joining Bart in a new Cover Tune Grab Bag. [fluidvideo url="https://www.youtube.com/embed/fJZ700bDUjg"]   Or, if you're the kind of person who likes to skip straight to dessert, here's Bart and Wally performing Taylor Swift's "Shake". [fluidvideo url="https://www.youtube.com/embed/tQ4OboZ5hVg"]

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