original_query: Who are the contenders in the Seat of Power?
query: Who were the contenders in the Seat of Power during Tawag ng Tanghalan Season 3?
answer: The provided text doesn't name specific contenders for the Seat of Power, but it explains the Seat of Power's role in selecting semifinalists for the Grand Finals.  The process involved semifinalists competing to claim the Seat of Power, which granted immunity and the ability to choose opponents.