Singer Beyonce has admitted she mimed her performance at Obama's inauguration ceremony.
She performed the song when Barack Obama was officially sworn in to his second term as American president but lots of people noticed she wasn't singing live.
Instead she pretended to sing to a pre-recorded backing track, something known as lip synching.
She says it is because she did not have enough time to rehearse the song.
She said: "It was a live television show and a very, very important emotional show for me."
"I did not feel comfortable taking a risk...... so I decided to sing along with my pre-recorded track which is very common in the music industry."
To prove how good her voice is she sang the anthem live for journalists at a press conference and promised not to lip synch when she performs at the Superbowl.
We want to know what you think about this one. Does it make the performance less impressive or is it ok because it was her voice anyway?
In the past it was much more common for singers to mime to a pre-recorded track, especially if they had a big dance routine which might make singing more difficult.
Do you think it matters? Should performers always sing live or are there some occasions where it is ok to lip synch?
This chat is now closed. Thanks to all of you who got in touch.
"Although it was an emotional time for her and she will remember it for the rest of her life, wouldn't it have been a bigger achievement to know that she DIDN'T use a pre-recorded track. In my opinion it is just like cheating."
Sian, Manchester, England
"I don't mind because it was a very important day and she didn't want to mess up. If she messed up I think that people would hate her forever."
Beatrice, London, England
"I don't think it matters, she was nervous, everyone gets nervous. Lots of people lip-synch, there's nothing wrong about it and it only means she really wanted the song to be flawless and brilliant."
Rithica , London, England
"Well I think it's better to hear Beyonce's actual voice instead of the recorded one but if she didn't have enough time to practice then I don't blame her."
Jessica, Durham, England
"I think that it was really bad that Beyonce mimed. Firstly I think you shouldn't mime when you are a professional singer. Also I think it was really bad as she was singing at an important event. It was a big honour for her, but she ruined it as she mimed."
Elana, Reading, England
"I don't care and others should not too, I think she is one of the best singers in the world! She can sing and that was her voice, she was only playing it safe, I would have done the same too!"
Olivia, Kent, England
"I think it was okay for Beyonce to lip-synch because there was probably a lot of pressure riding on this, so if she messed up, it would have been quite humiliating!"
Michael, London, England
"I think it is okay for singers to lip-synch, especially on this occasion because if she had got it wrong, it would have looked rubbish."
Heather, Livingston, Scotland
"I don't mind. It shows she is a normal person and gets nervous."
Amie, Leeds, England
"Yes, it matters to me. When I watched the inauguration, I thought she was singing live! I'm very disappointed that she lip-synched, even if it was to her own recording."
Grace, Pittsburgh, USA
"It was ok for her to lip-synch because she had to perform in front of a large crowd. Anyone would feel nervous - and not forgetting if she messed up then she would feel humiliated!"
Amelia, Bolton, England
"I think it's fine because it was an important moment in her career"
"I think they should never lip-synch even if it's their own voice. If I were Beyonce I would be really disappointed!"
Rayan, London, England