On this video, you can see
Elvis Presley and
Celine Dion singing (duet)
If I Can Dream at American Idol 2007. Look closely how Elvis Presley sings with Celine.
[youtube=425,350]lf-ucnIMqOs[/youtube]
This second video will tell us How they did it. Watch and listen on how do they split / edit the video.
[youtube=425,350]o8zR2nDdzYM[/youtube]