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In this Tuesday, June 26, 2012 photo, the "Rock-Ock" eight -neck electric guitar is on display as part of the touring National Guitar Museum exhibit at the Carnegie Science Center in Pittsburgh, through Sept. 30, 2012. The guitar was commissioned by the National Guitar Museum as an "Art Guitar" and the sign next to it says the 40-pound , 51-string instrument has been played by eight musicians at the same time playing "Crossroads." (AP Photo/Keith Srakocic)
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