The symphony orchestra is a remarkable thing, writes Norman Lebrecht. But “economically, it makes no sense at all. A sold-out symphony concert at the Royal Festival Hall yields an average loss of £48,000. It costs £1.9m a year in state subsidy and as much again in private fundraising to keep a London orchestra afloat. And yet, against all rational prognostications, five symphony orchestras and a dozen chamber ensembles flourish in this city of 12 million inhabitants, reaching (at an informed estimate) no more than 30,000 active concertgoers. The noose is getting tighter.”