Just a video for entertainment. Not AI. Olivia and Karen singing Close To You together for fun and "If only" it could have happened. I am not a professional, so just enjoy this for fun. Olivia's vocal is genuine, from a tribute to Karen she did at one of her concerts. No AI vocals, no fake. Just two womens voices synched together to hear how they might have sounded recording together.
No copyright infringements intended.