Vocal coach: Beyonce did lip-sync at Obama inauguration

At the inauguration of President Obama, did Beyonce lip sync the US National Anthem? There are conflicting reports from Washington but the lady herself is keeping quiet.

A spokeswoman for the US Marine band has confirmed the band itself was not playing live and could not comment on whether Beyonce's performance was pre-recorded.

To help demystify whether or not Beyonce sang live, Jon Sopel was joined Becky Gilhespie. a singing teacher at Soho Vocal Tuition in London.