Here's George Harrison performing "This Song" (a tune about his "My Sweet Lord" plagiarism trials) on German television.
He's lip-synching, which becomes obvious when the spoken bits (recorded by Eric Idle) appear out of nowhere at the 2:15 mark.
Interestingly, when George appeared on Saturday Night Live in 1976 - he brought along the videos of "This Song" and "Crackerbox Palace" even though he was available to perform the songs live. (He did two songs with Paul Simon instead).