By Christian May When Andy Haldane was the Bank of England’s chief economist he kept a keen eye on economic sentiment. Under his watch, the Bank experimented with a number of ways to feed sentiment analysis into the hard data that served as the life blood of the central bank’s forecasting and decision making. Early AI tools were used to aggregate the underlying tone of analyst notes and research papers, while Haldane even raised the prospect of analysing the nation’s Spotify song choices to get a fix on the mood of the public. What might he make of the fact that Linkin Park’s The Emptiness Mac…