who are the bgt semi finalists?
["Britain's Got Talent 2019 semi-finalists.", "Chapter 13 (Amanda Holden's Golden Buzzer)", "Giorgia Borg (Alesha Dixon's Golden Buzzer)", "Flakefleet Primary School choir (David Walliams's Golden Buzzer)", "Kojo Anim (Simon Cowell's Golden Buzzer)", "Akshat Singh (Ant and Dec's Golden Buzzer)", '4MG.']