Two singers, two different versions of a song

Here's the original version of Fuck You from the US singer whose stage name is Cee Lo Green:



Click the following image of a 22-year-old student named Anna to watch her performing a sign-language version of this song in playback:

Apparently Anna is not at all speech-impaired or deaf. She simply decided to learn sign language as a personal endeavor, to enhance her communication skills and to broaden her contacts with others.