Canadian singer/songwriter Daniel Powter has extended his reign at the top of the US pop chart to four weeks after his BAD DAY hit conTInues to keep reggae star Sean Paul and rapper TI at bay. Powter's song, which is used as a theme on hit TV talent contest American Idol, also steals a fourth week atop the Billboard Pop 100 and Hot Digital Songs charts. Sean Paul's TEMPERATURE and TI's WHAT YOU KNOW follow at numbers two and three respectively. The new chart's top debut belongs to former O-TOWN singer Ashley Parker Angel, whose LET U GO crashes in at 17.