Question: What banned formed in Olympia, Washington headlined the Decibelle music and cultural festival?
Sentence (from "National Cultural Festival"): Shin Koyamada played the lead character of Makibi featured during the on-stage opening ceremony of Okayama 2010 (The 25th National Cultural Festival Okayama 2010), which was held in Momotaro Arena on October 30, 2010.
Relevant evidence: No