Tottenham Hotspur Stadium, LondonThe veteran band may not have much new material to show for the past decade or so but this brutal, melodious mayhem still inspires catharsisSince re-forming in 2010, System of a Down (SOAD) have existed in some weird limbo, playing numerous big-ticket tours but releasing only two new songs, with mooted further new material conspicuous by its absence amid grumbling of impasses and creative conflicts.Tonight offers scant clues this deadlock has eased – certainly, there are no new songs – but SOAD don’t play like they’re retreading familiar material simply for filthy lucre. Viscerally heavy, they give everything a metal band should, including a guitar hero, Daron Malakian, who leads chants of: “Pull Oasis out of your ass!” and provokes a circle-pit that stretches from stage to exit; a bassist, Shavo Odadjian, gurning with unparalleled panache; and a frontman, Serj Tankian, who growls, croons, gets operatic and – at least once tonight – meows. Continue reading...