Jethro Tull frontman Ian Anderson is suffering from incurable lung condition, chronic obstructive pulmonary disease (COPD).The British rocker, 72, was diagnosed with the disease, which causes reduced lung capacity and leads to emphysema and bronchitis, two years ago, but has been managing the condition with medication.However, he told Dan Rather on AXS TV’s The Big Interview he fears COPD will eventually prevent him performing.“I’m going to tell you something I’ve never told anybody in public before,” he explained. “Since it’s you, I will take this moment to say I am suffering from an incurable lung disease with which I was diagnosed a couple of years back. … I do struggle; I have what are known as exacerbations – periods when I get an