On the above - in most shows of this nature that I watch, the coaches or mentors are understandably considerably younger than my 66 years, but I have little tolerance for their ignorance of who wrote original songs. They should research better, and pay credit where credit is due.
In the case of Tarryn Stokes above (and no criticism of her), her coach, Rita Ora, gave her the song to sing, described as
"Celine Dion's All By Myself"
It was actually a cover hit by Celine, radically rearranged and released by her in 1996, I think.
In fact, it originated with Eric Carmen, formerly of The Raspberries, in 1976, 20 years earlier, I was 19 at the time, and loved it.
It featured, in the middle, him playing, very competently, a piece from classical music composer Sergei Rachmaninoff.
Here it is from "Midnight Special"