Illumination and Universal Pictures’ animated let’s-put-on-a-show show Sing has reached the $600M mark at global turnstiles. The current split on the Garth Jennings-directed charmer is $269.7M domestic with $330.3M at the international box office. That makes for a nice round milestone through Sunday. Sing had passed $500M last month. The movie, featuring the voices of Matthew McConaughey, Reese Witherspoon, Taron Egerton and Scarlett Johansson, world premiered at last…