These shows are all about hidden treasures. First, there's the venue: Shady Tavern is a 69-year-old icehouse that's every bit as nice as the Alabama Ice House, if one-tenth as popular or overcrowded. Then there are the bills at the Secret Saturday shows: Since the talent is never announced beforehand, you never know if you're gonna hear rap, folk, blues or rock, or even if the show will be held indoors or outside in the bar's ramshackle beer garden. All you know for sure is that you are in for a pleasant afternoon of cheap beer, warm weather and music.