What are you listening to?

That's a very familiar piece; I feel like I've heard it recently, and fairly often, but I can't remember where - maybe in a soundtrack; maybe as on-hold music; maybe somewhere else. The Legacy section of the Wikipedia article on the piece doesn't list anything that seems to be a plausible candidate. Hmm.

In my own case I later realised that the reason this music was in my head was because there is a version on cello and other strings at the start of a video entitled "Dr. Bruce Greyson and the Paradox of the Near-Death Experience".
https://www.youtube.com/watch?v=ErQTIpNqSVQ