Reddit reviews Yo-Yo Ma Plays Ennio Morricone

Yo-Yo Ma has an entire CD of arrangements of Ennio Morricone music for cello + orchestra. I'm not sure if this is morose (probably not), but here's the version of "Ectasy of Gold" from that CD: https://www.youtube.com/watch?v=gBelSZAx4ro (The CD is on Spotify if you've got that and probably the other streaming services. I think the full thing can probably be on YouTube.)

Since we're talking about music from films (which I kind of think makes a good gateway to classical :-)):

I've also really fallen in love with the track "Il bell'Antonio, Tema III" from his latest(?) CD; here it is played by the composer (Giovanni Sollima) and Kathryn Stott (the same pianist as accompanies Ma on his CD).

Many of the tracks from Memoirs of a Geisha, composed by John Williams with Yo-Yo Ma as soloist. Here is a piano+cello arrangement of the theme (Ma on cello, Williams on piano), and here is a later track called "A Dream Discarded" for unaccompanied cello.

Many parts of the soundtrack from the video game Journey (composer Austin Wintory) also perhaps qualify; here's a concert arrangement, called "Woven Variations," of some of that music for orchestra + cello. (The recording quality isn't particularly good, but it's never been properly recorded, at least to my knowledge.)

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Edit: a few more suggestions from "less-standard" repertoire:

• "Dark Pastoral"; by David Matthews based on a very incomplete concerto started by Ralph Vaughan Williams (man I wish that RVW had a chance to finish...)
  
• "Requiem" by Peter Sculthorpe -- this is a stretch, just skip over it if you don't like it (Part 1, Part 2)
  
• If you liked Sollima's "Il bell'Antonio" linked above, you might listen to his "Violoncelles, Vibrez!"
  
• John William's "Elegy" (there for cello + piano; here is Yo-Yo Ma playing it with orchestra)
  
• Astor Piazzolla's "Invierno porteno" (Winter) from the Four Seasons of Buenos Aires
  
• Piazzolla's "Oblivion", here arranged for Piano/Flute/Cello (this is available in so many different instrumentations that I have no clue what it was originally)

My favorite recording.