Today Beyonce removed any doubts that she can sing when she sang the national anthem a capella at a Super Bowl press conference and she also said that it was always her plan to lip-synch at the Inauguration for the same reasons that Aretha Franklin said that she wish she would have lip-synched four years ago.
http://www.nola.com/superbowl/index.ssf ... press.html
I am a perfectionist. And one thing about me, I practice until my feet bleed and I did not have time to rehearse with the orchestra. It was a live television show, and a very very important emotional show for me, one of my proudest moments. And due to the weather, due to the delay, due to no proper sound check, I did not feel comfortable taking a risk. It was about the president and the inauguration, and I wanted to make him and my country proud, so I decided to sing along with my pre-recorded track, which is very common in the music industry. And I'm very proud of my performance."
I hope this explanation satisfies Friar.