Jo Whiley and Mark Radcliffe introduce the Arctic Monkeys from the Pyramid stage as they play their biggest show to date. Plus after midnight we catch up with Bjork, Damian Marley and Hot Chip and earlier acts performing include Kasabian, Amy Winehouse and Arcade Fire. Phill Jupitus and Lauren Laverne report back on all the goings-on and stories from the first day of the festival. There's also a special acoustic performance from Damien Rice.