Dusty Hill and Billy Gibbons of ZZ Top

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Dusty Hill and Billy Gibbons, right, of ZZ Top perform during the VH1 Rock Honors concert at the Mandalay Bay hotel-casino in Las Vegas on May 12, 2007. The duo has canceled its European tour so Hill can undergo treatment for a benign growth in his inner ear that's affecting his hearing. Its European tour was to start June 15 in Leipzig, Germany, and run into early July.(AP Photo/Jae C. Hong)

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Dusty Hill and B... Dusty Hill and Billy Gibbons, right, of ZZ Top perform during the VH1 Rock Honors concert at the Mandalay Bay hotel-casino in Las Vegas on May 12, 2007. The duo has canceled its European tour so Hill can undergo treatment for a benign growth in his inner ear that's affecting his hearing. Its European tour was to start June 15 in Leipzig, Germany, and run into early July.(AP Photo/Jae C. Hong)
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