Fifty years after Lowry’s death, a landmark documentary brings to light a newly discovered treasure trove of unheard audio tapes recorded with the artist. It explodes a lot of what we thought we knew about him, finds Nick Curtis A ll the little figures. It’s like a disease. You can’t stop it.” These are the words of the painter LS Lowry, discussing the compulsion that led him obsessively to depict the spindly hordes of the industrial working class in early 20th-century Manchester despite