Zz Top Cancel Tour Over Ill Health.... Zz Top have been forced to pull out of their upcoming European tour so bassist Dusty Hill can undergo hospital treatment.Hill will seek treatment for a benign growth in his inner ear that has been affecting his hearing - but is expected to make a full recovery.He says: "I'm looking forward to dealing with this problem and getting back out there with Billy and Frank...I'm sure we'll put this behind us very shortly."The European tour was due to begin on 15 June (07) in Leipzig, Germany. U.S.dates, which start in Dallas on 15 July, are not expected to be affected.