According to Wolf, “there was no opportunity” for the pop singer to rehearse with the Marine Band ahead of the inauguration. As a result, Wolf says, “it was determined that a live performance by the band was ill-advised for such a high-profile event.”

The official said each piece of music used during the inaugural festivities is pre-recorded to use on the fly “in case of freezing temperatures, equipment failure, or extenuating circumstances.”

While a spokesman told earlier Tuesday that the pop star was singing along to a pre-recorded version of the anthem, Wolf contends, “Regarding Ms. Knowles-Carter's vocal performance, no one in the Marine Band is in a position to assess whether it was live or pre-recorded.”