Japan's biggest urban rock festival, Summer Sonic (SS), held simultaneously in Chiba and Osaka, marked its tenth anniversary last weekend by expanding from two days to three. All three-day tickets for the Chiba end at the Chiba Marine Stadium and Makuhari Messe complex in Chiba were sold out before the weekend, a testament to the organizers' success in booking huge international acts. If Fuji Rock is characterized by its eclectic taste, SS focuses on what grabs your attention.