It's a cover, but it's still amazing. I showed Ricky this week the documentary Who Is Harry Nilsson (And Why Is Everybody Talking About Him)? which he liked. I think it's slightly biased and sycophantic-ish, but still worth checking out. And it's been streaming on Netflix for months, so it's easy to access. Ricky realized how much he liked Harry Nilsson's music, if nothing else.
Here's Everybody's Talking, from Midnight Cowboy, which is perhaps one of his biggest songs.
And here's One, which I used in college (both the original and the Three Dog Night cover) in a play I directed to try and set the tone of the beginning and end of the play.