Past the effulgent cherry red and puke green neon sign delineating Pike Place Market, through a perennial shower of raindrops and mist, and under a vertical column of winking, blinking marquee lights is Seattle's historic Showbox at the Market. Founded way back in '39 and still going strong, the Showbox ballroom has draw many of the greatest musicians and performers of all time. Name any artist or band, and they've probably graced the Showbox with their tunes and presence. Duke Ellington? Check. Muddy Waters?