Ian Anderson's ability to sustain a barrage of pithy flute notes while perched on one foot was a hallmark of Jethro Tull songs, albums and concerts. His balance may be as dependable as ever, but his lung capacity is far from it. Speaking with Dan Rather on tonight's The Big interview on AXS TV, Anderson revealed that he has COPD - chronic obstructive pulmonary disease, an incurable affliction that reduces lung capacity and strength. Anderson's announcement was the first time he has acknowledged the condition publicly and admitted that it makes it very difficult for him to perform up to his own and fan's expectations, but added, "It's not yet at the point that it affects my day to day life, I can still run for the bus,"