Bob Mould says he has lightened up. In fact, he emphatically insists upon it. 

After nearly three decades of hearing Mould play frosty, downtrodden, bitter-pill music - going back to the Reagan-era angst and aggression of his fabled Minneapolis band Husker Du - fans probably aren't expecting or even hoping to find any humour on his latest album, District Line. But he's not lying - it is there.