Unfortunately, Engelbert Humperdinck did not perform at The Last Waltz. The Last Waltz was a legendary concert film celebrating the final performance of The Band, featuring a wide range of musicians and artists. There’s no recorded performance of a song called "Flashback" by Engelbert Humperdinck, nor is there any mention of him being involved in the event. Therefore, I cannot provide a description of a song that doesn’t exist.
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