The recording was taken from the singer's performance last year
US singer Beyonce Knowles has laughed off a hoax recording on the internet which was tampered with to make her singing sound off-key.
Radio host Howard Stern played the clip on his show saying he did not know who had leaked it, but thought the singer would want to "strangle" them.
The rendition of her singing If I Were a Boy has been identified as a joke.
Knowles told the US TV show Today that although she had not heard it, she had been told it was "very over the top".
She added: "I haven't heard it, but I do know that it was a complete joke.
"It's so amazing that someone in their home can do a little prank and it can end up on these major radio shows."
On his Sirius radio show, Stern said the recording had been taken from a "board feed", which is the raw voice of the star singing along to a backing track.
Art student Matthew Zeghibe from Connecticut created the clip and said he was "just trying to make a point".
Speaking to Rolling Stone he said: "I wanted to show people how easy it is to manipulate someone's voice.
"If I can do it with a clip I pulled off of TV, imagine what they are doing on records and during live performances.
"The entire industry has been so manipulated, because there's such an emphasis on perfection, so when something like this happens, it causes such a stir."
His version was taken from Knowles' performance on the Today show in November last year.
"It was just for a good laugh. It was a goof, just for fun. I do a lot of parodies on my YouTube channel, and it just so happens this one got a little out of hand," he said.