Summersonic, held over two days in mid-August at Makuhari Messe in Chiba, attracts over 100,000 people each year and is usually headlined by major rock and R&B acts. Nine-piece group Girls Generation prepared to take to the stage as a late addition to the line-up, which ended up as one the most attended shows of the festival. The girls discussed their development and training over many years, and how it has helped them prepare for the big stage across Asia, with upcoming shows in the US ahead.