Carnegie Hall | Royal Albert Hall | Roy Rogers | Roy Orbison | National Baseball Hall of Fame and Museum | Royal Festival Hall | Roy Lichtenstein | National Museum of Racing and Hall of Fame | Pro Football Hall of Fame | Hallmark Hall of Fame | music hall | Wigmore Hall | Radio City Music Hall | Hall & Oates | Queen Elizabeth Hall | Tammany Hall | Rock and Roll Hall of Fame | Roy Thomas | Roy Haynes | Roy Clark | Trinity Hall, Cambridge | Seton Hall University | College Football Hall of Fame | City Hall | Suntory Hall | International Tennis Hall of Fame | Arundhati Roy | Thomson Reuters | Thomson | Roy Jenkins |
Mattila appears regularly in the major opera houses worldwide, including the Metropolitan Opera, the Royal Opera House in London, Théâtre du Châtelet, Opéra Bastille, the Lyric Opera of Chicago, San Francisco Opera, Houston Grand Opera, Vienna State Opera, Toronto Roy Thomson Hall and Großes Festspielhaus, Salzburg and with top orchestras.