In Sync But Not In Tune

If you watched the inauguration, you saw Yo-Yo Ma on cello and Itzhak Perlman on violin, playing a John Williams piece. But what you heard was prerecorded.

"This isn't Milli Vanilli," Florman insisted, referring to the late 1980s group stripped of a Grammy for lip-syncing. "They had to perform in such cold weather, the instruments couldn't possibly be in tune. They were able to play in sync with the tape. It's not unusual."

I'd say it's Milli Vanilli
as played by Chilly Willy.