It was not precisely lip-synching, but pretty close.
The somber, elegiac tones before President Obama’s oath of office at the inauguration on Tuesday came from the instruments of Yo-Yo Ma, Itzhak Perlman and two colleagues. But what the millions on the National Mall and watching on television heard was in fact a recording, made two days earlier by the quartet and matched tone for tone by the musicians playing along. ...
“It would have been a disaster if we had done it any other way,” [Perlman] said in a telephone interview on Thursday. “This occasion’s got to be perfect. You can’t have any slip-ups.”
--Daniel J. Wakin, NYT, on how when the going gets tough, the tough pre-record. See part 1 of this series.