Good news has been hard to come by in the orchestral world in the past year or two, and the sorry saga of the Calgary Philharmonic Orchestra, which ceased playing concerts and filed for bankruptcy protection last October, was one of the hardest blows. But as of last week, the CPO is back in business, and out of debt. At the inaugural reopening concert, orchestra musicians greeted concertgoers at the door to the hall, shaking their hands and thanking them for their role in rescuing the ensemble. All told, the CPO raised better than $1.5 million over the months it was inactive to satisfy its creditors.