* Singer emphasizes live performance after lip-synch flap * Beyonce's former bandmates surprise, thrill fans * Jennifer Hudson sings with Sandy Hook choir * Alicia Keys performs national anthem By Eric Kelsey Feb 3 (Reuters) - Singer Beyonce strutted and shimmied her way through football's Super Bowl half-time show and thrilled fans by reuniting with her former Destiny's Child bandmates on Sunday in New Orleans.