John Lewis and Partners is a well-known general department store in Great Britain. It's the type of old-fashioned department store that, like the late and lamented B. Altman and Co. (which you can see recreated in The Marvelous Mrs. Maisel), carries everything from clothing to electric appliances.
Christmas TV commercials and Christmas shows are a big big thing in English television, much bigger than here in the United States. It is often the season when extinct TV shows come alive for one new episode on one night.
John Lewis's Christmas commercial. "The Boy and The Piano," stars a big "get": Elton John. It's a musical tour through his life that mixes old and new footage, with de-aged Elton mixed with young Elton and old Elton.
I liked it, but there's been a lot of odd hate for it online. You decide. Either you'll smile or you won't.