KeyBank is assuming the naming rights deal for the southwestern Pennsylvania outdoor concert venue most recently known as First Niagara Pavilion.The 23,000-capacity amphitheater near Burgettstown is run by concert promoter Live Nation.KeyBank's parent company, KeyCorp earlier this year bought out Buffalo, New York-based First Niagara Financial Group to become the nation's 13th largest commercial bank.The takeover brought KeyBank into the greater Pittsburgh market for the first time.The amphitheater, about 30 miles west of Pittsburgh, will now be known as KeyBank Pavilion. It features more than 7,000 reserved seats under a covered, open-air pavilion and stage, and a general admission lawn that can accommodate 16,000 more people.